Good evening. Im George Stephanopoulos in for david tonight and we begin with that wild ride on wall street. The worst day in more than four years after the second worst on friday. Millions of americans watched a bungee jump of a day. At the opening bell the dow plunged more than a thousand points. Rebounding by midday then a Late Afternoon nosedive closing down over 580 points. Its a Chain Reaction that started in china daalcalling it black monday there. Abcs chief Business CorrespondentRebecca Jarvis starts us off. Reporter it started with a plunge. The dow cratering an unprecedented 1,000 points just minutes after the opening bell. It give you little butterflies in your stomach. Reporter even veteran traders stunned by the drop. Whats one word to describe the feeling on the floor today . Anxious. Reporter moments later stocks clawing back, reversing some of the losses. People were nervous, but there was not that sick feeling in your stomach that sometimes you get at times like this. Reporter before plummeting yet again. So whats driving the volatility . Triggered by a massive selloff that started in china last week, the dow now down 1600 in just 5 days. Traders fearing the slowdown in china could lead to weakness here. The white house trying to calm those nerves. What i would encourage people to evaluate is the ongoing strength and resilience of the u. S. Economy. Reporter but to many on wall street, with stocks up nearly 60 over the last five years, todays slide was long overdue. There feels like theres this disconnect. The economys chugging along, but the market has gone up exponentially. The market has gotten ahead of where the actual economy is. Reporter day ending with an unusual sigh of relief. The dow down 588 points. But it could have been so much worse. And the typical 401 k has now lost about 9,000 in just the last week. What happens next comes down to how chinese stocks fare overnight and traders will likely be feeling more of those butterflies tomorrow and well be tracking it. Thanks very much. Now to those american heroes making headlines around the world. Three childhood friends from california awarded frances highest honor today for their quick action and courage. Unarmed, unafraid they tackled and hogtied the terrorist who opened fire on that train headed to france. Now another american hero. The professor who took a bullet when he moved in on the gunman. David wright reports. Reporter two of the american heroes arrived in ramstein, germany, for medical treatment at a military hospital. First stop on their journey home after this incredible ordeal. Today, we went to see for ourselves how they helped prevent a massacre. Im riding the train today retracing the journey that turned three childhood friends into heroes. The three of them were traveling on this highspeed train bound asleep. Sitting nearby that other mugalian and his wife. The gunman emerged from the bathroom shirtless and strapped with an ak47. The professor was the first to confront him grabbing the ak47 which had jammed. He didnt realize that Ayoub El Khazzani also had a handgun and as he turned to protect his wife he was shot in the back. Thats when the three american friends pounced. Alek hit me on the shoulder and said lets go and ran down tackled him. Reporter Airman Spencer Stone almost lost his thumb in the struggle as the gunman fought back with a box cutter. Once subdued and hog tying him with the conductors red necktie stone gave first aid to mugalian saving his life. I found what i thought to be the artery, pushed down and the bleeding stopped. Reporter today the french president called their courage an example to the world awarding them the legion of honor. The gunman was known to authorities. France had him on a security watch list since february 2014 after spanish authorities told them he had ties to islamic extreme i69ist extremists. Tonight he is expected to make a full recovery and as soon as he does hes going to get the legion of honor too. Thanks very much. There are new moves in the race for the white house. All eyes on Vice President biden after that secret meeting with Elizabeth Warren over the weekend then his private lunch with president obama today. Speculation that biden could run now to fever pitch which could put president obama in an awkward spot. Does he endorce hillary or joe . Jon karl put that question to the white house. Reporter Vice President biden and president obama met today behind closed doors. A race pitting his vp against his former secretary of state would put the president in tough spot. Today the white house said the president may take sides if that happens and endorse one of them and even seemed give the veep a little boost. The president has indicated that to add joe biden to the ticket as his running mate was the smartest decision that he had ever made in politics. So i assume that means the president would support Vice President biden if he were to run and this is obvious a better decision than the secretary of state he chose so [ laughter ] reporter the man leading the Draft Biden Movement is josh alcorn, a close friend of bidens son beau who died in may. How did beau look at all of this . Theres no doubt in my mind, jon, that beau wanted to see his dad as president. Reporter Hillary Clinton is now relaxing in the hamptons, seen here in these exclusionve photos by the daily mail. 46 but taking nothing for granted, she plans to interrupt her vacation, heading back out on the campaign trail later this week. And, jon, what more do we know about the timing of this decision and where bidens head is right now . Reporter several democrats close to biden told me it is more likely than not that he decides to run. He has not made a decision yet, george, but i am told he has already asked aides to put together budgets, to look at what it would cost to launch a campaign. As for the timing of that decision, i am told that biden has told friends that the absolute deadline, the last possible moment that he can make a decision is before the first democratic debate which is the middle of october. And doing all the Due Diligence before that. Jon, thanks very much. No you to that monster wildfire in Washington State, the biggest in that states history. Stunning images coming in and evacuations under way tonight. Abcs Kendis Gibson is there. Reporter tonight, thousands more Washington State residents evacuating their homes, with flames just steps from their front doors. I didnt think that there was any hope. Reporter the okanogan complex fires at more than 400 square miles, the largest in state history. Its unrelenting so far. Reporter battleweary firefighters getting reinforcements on the front lines tonight from new west. This Southern California ski resort using snow cannons to stop the fires from spreading and smoke from all these fires now visible on satellite as far south as florida. Here in washington, officials in several communities warning people to stay indoors. Oh, my gosh, its horrible. Reporter the air so bad around here Health Officials encouraging people to wear these sort of heavyduty respirator masks or at least one with a filter. George. Thank you, kendis. We are following a developmenting story in new york. You can see the grizzly crash scene where a casino bus slammed into a Apartment Building in queens. The driver of that bus trapped inside. Heres abcs mara schiavocampo. Reporter tonight, a devastating scene where that bus slammed into a building injuring at least half a dozen people. The vehicle, run by resorts world casino, badly damaging the structure in this residential new york city neighborhood taking out a large chunk of two stories. No cars cut him off, nothing. All of a sudden he plows right in, into the building. Reporter the driver pinned inside until rescuers could free him. He hit the building. He was trapped, Fire Department had to extricate him using the jaws of life. He was transported by ems. Reporter in the past riding a casino bus has sometimes been a gamble, some involved in terrible accidents. 15 killed in this 2011 new york crash. And earlier this year, 30 hurt near los angeles when this casinobound bus collided with an 18wheeler. Now, the red cross is on the scene. And in a statement, the casino bus operator says they are cooperating fully with the authorities in the investigation. George . A lot of questions out there. Manage, mara. New developments tonight in that deadly air show crash, the horrifying moment caught on tape when a vintage plane spins out of control right into a crowded highway shooting a fireball into the sky. Moments later, the wreckage still in flames. At least 11 People Killed and now that death toll expected to go up. Abcs terry moran is on the scene. Reporter today at the crash site, a crane gently lifted pieces of wreckage from the roadside. Remains here from that almost surreal moment at saturdays air show, captured on so many cell the 1950sera Hawker Hunter t7, high in the cloudless sky performing a thrilling loop above the crowd. Then failing to pull up and exploding onto a highway. Oh reporter a terrifying, traumatizing sight. Oh. Theres nothing we can do but stay where we are. Reporter the huge fireball of impact, the plane, loaded with fuel. This whole scene is now a memorial, people leaving flowers and notes of sympathy and prayer. The inferno of the crash, just a couple hundred yards back there, and given that this is an area of many villages, local businesses and busy highways are in this area, its a miracle there werent more victims. Alish southall was on that road when the jet came down. We just ran and just protected ourselves. Did you feel the heat of the fire . Yeah, you felt the heat of the fire and it was more the noise, as well, the crash. Reporter survival and loss in an incomprehensible instant. Terry moran, abc news, west sussex, england. That is so horrifying. To syria and ancient artifacts targeted for destruction by isis. The group destroyed one of the most important roman temples in palmyra rigging it with explosives. It dated back nearly 2,000 years. Back home in louisiana a state trooper killed in the line of duty. Police say he died today one day after being shot in the head by a stranded driver. He was trying to help the gunman who was tackled by bystanders. Flags in louisiana being flown fallen officer. Now to that disturbing case out of New Hampshire where a former student is on trial accused of raping a younger classmate. Raising questions about the culture inside one of the most elite prep schools in america. Heres abcs gio benitez. Reporter tonight, students and graduates of the elite New Hampshire prep school, st. Pauls, have taken the stand. Testifying that their friend, 19yearold owen labrie, told them he had sex with a 15yearold schoolmate last year. I had left under the impression that they did have sex in the time wherever they were. Sex with who . Owen and jesse. Tell anyone . I believe so, yes. Reporter in an emotional three days of testimony last week, the alleged victim, now 16, says labrie raped her. But labrie denies ever having sex with the girl. His defense attorney challenges her story. Well, why were you cloudy . I was raped. Reporter the detective remembers going back to the scene with the girl. She started crying. She was unable to talk to me or answer any questions beyond pointing out the area that owen had put a blanket down. Reporter theyre trying to establish reasonable doubt saying his messages about sex was teenage exaggerations. He could end up being the defenses only witness to take the stand. I know youll be watching. Gio, thanks. Extraordinary new video taking us inside that brazen prison break. The two vi convicts who broke free and a 20minute journey squeezing through hole, crawling across catwalks to temporary freedom. Abcs linzie janis has the tape. Reporter this obtained by abc news revealing how david sweat and richard matt raced from their prison celling to freedom in just 20 minutes. Shot by two investigators, the video shows how the inmates crawled through holes in their cells onto the catwalks behind. Then shimmying down four floors to the prisons underground tunnel system. In nine minutes they made it the length of two cell blocks and are entering the last one. Approaching the first significantly tight squeeze. Reporter minutes later, theyre under the prison yard. Underneath the asphalt yard. Reporter connecting with that now infamous steam pipe. Im gonna get in this pipe. Reporter the investigators squeezing through. Emerging from the steam pipe. Reporter and three minutes later, theyre free emerging through that manhole on to the street. Their brazen escape kicking off a massive manhunt across this dense terrain. Police killing matt, capturing sweat alive just a mile and a half from the canadian border. Sweat in court just days ago facing new charges. Linzie janis, abc news, new york. Thanks, linzie. Much more to ahead. New developments in the Ashley Madison hacking scandal. Police link it to suicides. Tonight the reward to hunt down the hackers. Warning about ground beef. It may have you cooking the bhurger a while longer. Special delivery at the zoo. The surprise no one was expecting. We stop arthritis pain, so you dont have to stop. 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This is also a scam. Nobody is going to be able to erase that information. Reporter police now calling last weeks leak of more than 30 million users names, addresses and credit card information one of the largest data breaches ever. Exposing 13,000 u. S. Government accounts, vatican account, as well as former reality tv star josh duggar. The Canadian Company behind Ashley Madison now offering a reward, 500,000 Canadian Dollars for information leading to the arrest of the hackers. And police today sending them a direct warning. I want to make it very clear to you, your actions are illegal and will not be tolerated. This is your wakeup call. Reporter Ashley Madisons Parent Company released a statement this afternoon calling the hack a malicious act. Anyone whos been victimized by the breach is being advised to call police, george. Okay, thanks very much. When we come back a switch. The city now called the most honest in america. Also how safe is your ground beef . 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