And the dramatic moments. The bank robber, the manager, trying to hold the door shut. How this ends. Good evening. And its great to have you with us here on a thursday night. And it is fight night for the republicans, but one fight began long before the debate stage. The one between donald trump and fox news. Trump skipping the debate and holding his own event. This comes after trumps long simmering feud with fox news over moderator megyn kelly, who maintains her questions, the last time she moderated, were fair. And without donald trump there tonight, ted cruz moves to the center of the stage. Is he ready for whats coming . And one last attempt to get trump back into the debate from fox host bill oreilly. It got heated. Abcs tom llamas in iowa with how it played out. Reporter tonight, donald trump, far from that debate stage, could still steal the show. Well, at this point, it does his last and best chance to speak to as many iowana as possible. Reporter that admission from fox news heavyweight bill oreilly pleaded with trump to change his mind. In your christian faith, there is a very significant tenant, thans the tenant of forgiveness. I think you should forgive not in ways you dont like, but i think you should be the bigger dont you think thats the right thing to do . It probably is. But you know, its called an eye for an eye. I guess also you can look at it that way. Oh, no, no, no. Thats old testament. Eye for the eye rule goes out. Turning the other cheek. Bill, let me tell you, are taking this much more seriously than i am. Kelly. I dont think shes very good at what she does. I think shes highly overrated. Reporter oreilly trying again. Right . Say, look, i might come back, forgive, go forward, answer the questions, look out for the folks. Well, even though you and i had an agreement that you wouldnt ask me that, which we did. I will, therefore, forget that you asked me that. Because i told you up front, i said, dont ask me that question, because its an embarrassing question to you. And i dont want to embarrass you. Im not going to listen to anybody. Reporter but trump wont budge. So, there will be no repeat of his rumble with kelly at the very first Republican Debate. Youve called women you dont like fat pigs, dogs, slobs and disgusting animals. Your twitter account only rosie odonnell. No, it wasnt. For the record it was well beyond rosie odonnell. Reporter now, trumps opponents, calling him out. Donald trump is skipping the last debate before the Iowa Caucuses. Why . Trump cant handle tough questions. Reporter jeb bush tweeting, handle the foxnews debate, what else will he not be able to ted cruz demanding to debate trump calling that a publicity stunt. Do you think donald trump is afraid to debate you personally . I think hes afraid of the people of iowa. Questions. He doesnt want to defend his record. Hoping to place in the top three in iowa to build momentum, tonights showdown. Oh, Donald Trumps not going to show up. Ted cruz is challenging him in a oneonone, mano a mano debate. Interesting sideshow. Greatest show on earth. This is not a show. This is serious. Reporter and david, tonight, trumps event being billed as for veterans. Mike huckabee and Rick Santorum will be at the trump event. But they say, theyre not going because of trump, theyre going because of the veterans. David . Tom llamas, our thanks to you. Lets get right to george stephanopoulos, who is leading our coverage of the Iowa Caucuses in just four days now. And george, first off, the trump campaign. They say theyre not concerned there a gamble here in not showing up . If trump were a normal candidate, this would be a dealbreaker. It would raise quells s temperament, but theres a real risk here. Heres the calculation. What does he get in return . Control. He controls the news cycle before the debate, controls it during the debate. Controls a lot of it after the debate. He eliminates a risk, as well. A question that trips him up. A confrontation with a rival that draws blood. A businessman would look at this, say, this is a good bet. In the meantime, with trump not there, they say theyre going to remove the podium, that brings ted cruz front and center. Is he prepared . As well. Hes lost a lot of momentum in the last couple of weeks. He needs to be center stage, if he handles those attacks well and reminds people, those people in iowa, why they liked him in the first place, it could help him a real lot. This could be the biggest nightle of the capable for him. So much. America and a reminder, after tonight, the next Republican Debate is right here on abc. I hope youll join Martha Raddatz and me, saturday night, february 6th, when we moderate the Republican Debate, before the key state of New Hampshire, right here. In the meantime, to the democratic side tonight, and just four days to go to iowa, as weve mentioned here, where it is a race to the finish. Every night, a new poll, a new leader. Tonight, Hillary Clinton on top, barely edging out Bernie Sanders in iowa. Tonight, shes doubling down. Former president bill Clinton Holding several accept rat events. Trying to fight Bernie Sanders last minute push before the caucuses. Abcs jonathan karl, oneonone with sanders tonight. Will he debate hill little before New Hampshire . And what clinton is now saying about adding a new debate. Reporter two for the price of one. Hillary clinton is bringing in bill for the big final push in iowa. You need to caucus for hillary. Mrs. Clinton is now saying she wants more debates, starting next week. We have to agree were going to debate in New Hampshire, both the governor and i have agreed and were waiting for the senator to decide to join us. Reporter we asked Bernie Sanders about that. I wanted more debates from day one. Reporter i know. Gee, a couple months ago, it wasnt the clinton people were interested. I wonder what has happened now that they want more debates. What do you think has changed . Reporter heres whats changed. Sanders is surging. Bigger, more energetic crowds. We stopped by his Campaign Headquarters today. So busy trying to score an upset iowa win, this volunteer had no time for us. Hows it going . Going well. Im a little bit too busy right now to talk though. Im sorry. Reporter and today, the 74yearold candidate released a doctors note declaring hes in overall good health. Good humor, too. How healthy are you . I am you know, thank god. You always want to knock on wood. Activity in iowa today. Sanders with four campaign events, Hillary Clinton with three, and bill clinton looking like a candidate himself, with four events all over the state. That sanders volunteer, too busy to talk to jon karl. Ive never seen that happen. Jon with us live from iowa tonight. Jon, we see how close this race is. They trade the top spot almost every night. This is all going to come down to their ground games. Reporter yeah, and the ground game is especially challenging for Bernie Sanders, because hes relying on young voters, some people who have never caucused in iowa before. They have to get out. As for Hillary Clinton, she got beat in the ground game eight years ago. They are bound and determined not to get beat again. Jon karl, thank you. Were going to turn now to breaking developments in the deadly militia standoff in oregon. Heavily armed police racing to the compound where the few remaining antigovernment protesters remain holed up on federal property. The groups leader today urging them to surrender. All of this coming after this weeks deadly shootout, and word authorities now racing to the abcs Neal Karlinsky in oregon for us again tonight. Reporter late today, a huge convoy of heavilyarmed police could be seen streaming into the compound. Those last armed occupiers left inside hate been sending out videos on youtube, ranting about the federal government. Just drop the charges and nobody dies. Reporter tonight, abc news has learned that authorities plan to release a videotape that shows the moment armed rancher, Lavoy Finicum is killed by police. From the Police Traffic stop that led to the arrest of his fellow occupiers, crashing into a snow bank. Once out of his truck, they say he was told to put his arms up, but instead, brought them down and could be seen reaching for a weapon. Thats when he was shot. Now, the standoff that began 26 days ago, when heavyarmed ranchers took over this wildlife refuge, paralyzing a small community, appears to be almost at its end. We never wanted bloodshed. And we continue to do so. Reporter tonight, the groups leaders each face up to six years in federal prison, after a month of mayhem here. David . Neal karlinsky with us again tonight. Urgent new warnings this evening about the zika virus. The held of the World Health Organization saying it is, quote, spreading explosively. By one estimate, up to 4 million cases across north and south america in the next year. Here in the u. S. , at least 31 cases in 11 states, and late today, the first case in boston. All contracted before coming back to the u. S. And this map showing the parts of the country shorts say are most vulnerable now. Zika virus linked to a serious birth detect, babies born with shrunken heads. So, the question, how long does it stay in your body, and does it affect future pregnancies . Dr. Richard besser is in brazil for us tonight. Reporter fabiola takes us to her home in rio. Shes a physical therapist, five months pregnant with her third child. And now spending her hardearned income on insect repellants. Reapplying every two hours. Shes most afraid for her unborn baby. Zika may be linked to micro microcephaly. Up to 1. 5 million cases of zika so far here in brazil. Its spreading in 23 areas across the americas. The World Health Organization expects 3 to 4 million cases overall, saying, the level of alarm is extremely high. In the u. S. , at least 31 Lab Confirmed cases in 11 states. All people who traveled to affected areas and returned. And as of today, state Health Departments will be required to report all new cases to the cdc. Theres no vaccine yet. No treatment. The brazilian government spraying for mosquitos. The only action people can take is to avoid getting bitten. Our team here keeps applying also does fabiola. Lets get right to dr. Besser tonight, joining us from brazil. And first, rich, lets tackle what people back here in the u. S. Are concerned about. If a neighbor comes home from one of these regions with the zika virus, can they then pass it to their neighbors . Reporter well, they can. If they come back and theyre infected and a mosquito bites them, that mosquito can bite other people and infect them. If you have any symptoms when you return, see your doctor. And tell your family and the people around you to use the repellant, too. And you pointed out, rich, that pregnant women need to be most concerned. How long does the virus stay in the system and can it affect a future pregnancy . Reporter well, if you look at similartype viruses, what they find is, when a person recovers from that infection, after about a week or so, and their symptoms are gone, the virus is out of their body. So, scientists dont believe that future pregnancies are going to be at any risk at all. Just the current one, when youre infected. Dr. Besser on this again tonight. Dr. Besser, thank you. Skarl out of texas were following. An apparent gas leak at a middle school. More than 100 students and teachers evacuated. Some taken out of stretchers, whisked to the hospital. One student unconscious. Abcs ryan owens in dallas tonight, where there were no warning signs until students and staff began falling ill. Reporter for more than 100 students and staff at this texas middle school, their school day ended at the hospital. Being checked out for symptoms of Carbon Monoxide poisoning. Showed symptoms of nausea and headache and some were vomiting and, of course, ems treated and took the appropriate medical action. Reporter some students left on stretchers. Others loaded into buses to a local hospital. Everyone didnt really know how to react to it, because this never happened before. Reporter the fire chief in the city of beaumont, east of houston, believes the gas was leaking from a boiler at marshall middle school. The leak was first reported around 10 30 this morning, when one child fell unconscious. Expected to be okay, but authorities are vowing, no one will be allowed in that school until they know its safe. The fire chief says there were no Carbon Monoxide detect tomorrows inside that school. So, the first time of trouble was when kids started getting sick. David . All right, ryan owens from texas. Thanks, ryan. And a Major Development in the case of ethan couch tonight. The socalled affluenza teen is now back in the u. S. In texas, after weeks on the run in mexico. But what kind of punishment does he face now . Abcs matt gutman from texas. Reporter tonight, ethan couch escorted into the very place he allegely tried to flee, the Tarrant County jail. The millionaires son, with the now shg aggy beard, brought back to the u. S. By mexican officials. Couch in coach, then escorted between two u. S. Marshals after arriving in dallas. We hope now justice can be served for those four victims and their families. Reporter in 2013, the killing four bystanders in a drunk driving wreck. During sentencing, his legal team claimed he suffered from affluenza, too spoiled by his parents to know right from wrong. The judge gave him probation only, ten years. Authorities say he and his mother skipped probation, crossing the border into mexico. In the hearing here tomorrow, a judge could decide to keep ethan couch here until his 19th birthday, and david, since his flight to mexico, ethan couch has already spent more time in detention than he ever did after killing those four people. David . All right, matt gutman in ft. Worth tonight. Thanks, matt. There is still much more this thursday. The sonic boom mystery that had the ground shaking on the east coast today. So many asking, what was it . Also, the dramatic video. The bank robbery here. The manager struggling to keep that door closed. Youll see how it plays out right on the video. Also, whats happening . First, the hockey ref taken down on the ice, then, the cheerleader, look at this, officials now taking action and we saw it with the adele tour here in america, then Bruce Springsteen concerts, as well. And heres the question. When you race to get tickets, do you even have a chance against the computers . Our reporter getting answers for you. How many tickets are really available when they go on sale . Well be right back. Your body was made for Better Things than rheumatoid arthritis. Before you and your rheumatologist move to a biologic, ask if xeljanz is right for you. Xeljanz is a small pill for adults with moderate to severe ra for whom methotrexate did not work well. Xeljanz can reduce joint pain and swelling in as little as two weeks, and help stop further joint damage. Xeljanz can lower your ability to fight infections, including tuberculosis. Serious, sometimes fatal infections, lymphoma, and other cancers have happened. Dont start xeljanz if you have an infection. Tears in the stomach or intestines, low blood cell counts, and higher liver tests and cholesterol levels have happened. Your doctor should perform blood tests before you start and while taking xeljanz, and monitor certain liver tests. Tell your doctor if you were in a region where fungal and if you have had tb, hepatitis b or c, or are prone to infections. R xeljanz can reduce r the symptoms of ra, p even without methotrexate. Rask your rheumatologist t about xeljanz. If you have high Blood Pressure like i do, may raise your Blood Pressure. Thats why theres coricidin hbp. It relieves cold symptoms without raising Blood Pressure. So look for powerful Cold Medicine with a heart. Coricidin hbp. Next tonight here, our team getting answers. Youll remember adele fans were outraged when her american tour sold out in an hour. Tickets almost impossible to get. Well, tonight, a threeyear investigation of the ticket industry now revealing just how little chance you have in getting those tickets. Heres abcs chief Business Correspondent rebecca jarvis. Reporter from adele to Bruce Springsteen dancing in the dark reporter thousands of frustrated fans shut out or forced to pay as much as 9,000 a ticket to their shows. Tonight, the new York Attorney general says the system is rigged against the consumer. Middlemen, brokers, ticket vendors and more who really use some illegal, are in a shadow network. Reporter the majority of tickets go to presales and music insiders, leaving less than half reserved for the public. Even then, ordinary fans have to compete with resellers. Some who may use special software known as bots to buy up blocks of tickets at lightning fast speeds, often marking them up to astro no, maamicly high prices on the resale market. And thats what we call a rigged system. Reporter and investigators say tonight this is just the beginning of creating a level Playing Field in the ticket industry. They will be working with lawmakers next to target those bad actors, david. So, people arent just imagining this. This is real . Reporter its happening. Rebecca, thank you. When we come back here tonight, what happened 30 years ago today. Also, the sonic boom mystery, causing the ground to shake in part of this country today. And then, look at this. The armed bank robber, stopped in his tra