Two shooters the mysterious shooters girlfriend who says she knew nothing of the plot. It doesnt make sense. She had to have known something. What does the hotel know . No gun policy in your hotel. And a virtual arm ory of weapons on a 32nd story suite. And most of all, who was Stephen Paddock and how did he go from professional gambler to mass murderer. Bedroom, lounge room and gun room. Gun room . A deadly puzzle but why dont the pieces fit . Whats insinuated what youre saying is people are willfully concealing the truth. The plot thickens. Im ez vargas. Im david muir and this is 20 20. Here now matt gutman. Reporter this week in vegas, its been business as usual. The party is rocking into the night. But 15 miles from the glitz of the strip, Russell Bleck is up and awake for a different reason. I have literally five nightmares a night, ive counted. And i cant break the cycle. Reporter bleck and his fiance breanna are two of the many survivors of the mass shooting at the route 91 festival. Bleck famously captured some of it on his cell phone. That was an ar reporter and though the shooting stopped nearly four weeks ago, for him and so many others, the incident isnt over. I wake up from a nightmare and just ran down this hallway. Ill just run into this closet and shut the lights off and shut the door and put my body against it so no one cant kind of come in and reporter his fiance was too emotional to even to speak us. It took me two weeks, three weeks now to be able to look at her. And just, the sheer fear you know, on her face, thats something that youre never going to forget. Reporter but bleck is troubled by more than the visceral memories he has of that night. Like other survivors we spoke to, hes also disturbed by what he considers the lingering questions, the missing answers about what really happened. The question that troubles me the most is the timeline, i want to know what happened. Reporter the official timeline has changed at least three times. It just doesnt make any sense. Because these things are pretty basic. The word incompetence has been brought forward and im absolutely offended with the characterization. Reporter and just this week, the New York Times came out with its own timeline. By forensically analyzing these clips, we were able to draw perhaps the most complete picture to date of what happened. Reporter remarkably, it took authorities some time to figure out even when paddock first checked in to the mandalay bay. Originally, it was on september 28th and then it shifted to september 25th. He changes rooms, it sounds like. Did he decide, i want a room on a different floor, for the different angle . Thats entirely possible. Reporter but the center of the timeline controversy revolves around this man, Security Officer jesus campos, who was shot by paddock through his hotel suite door. But exactly when . In the First Official version of events campos encounters paddock at the end of his shooting rampage perhaps preventing further loss of life. Reporter ill just reaffirm to you that jesus campos is a true hero. But that turned out to be not the case. It is, i will just say, out right odd to say someone is a hero who stopped this shooting when now it appears thats really not the case. Why is that so difficult to figure out . Reporter campos is shot at 9 59 pm, a full six minutes before the shooting spree began. It didnt make sense at the time because, you know, if youre a gunman who has prepared for months, why would you wait six minutes after having your plans interrupted by a hotel Security Officer to then start firing on the crowd . Reporter third and final version for now the police in the hotel say campos was shot at about the same time as the shooting unfolded. That New York Times video timeline provides some additional clues as to the possible timing. In the first burst, the gunman fires around 60 bullets of a 100 capacity magazine. Theres a pause then of around 36 seconds. We do know that the hotel Security Officer is in the hallway in or around that time. Perhaps a gun jammed. Or perhaps he used the remainder of that cartridge on this, the hotel Security Officer. Yet we still dont know if he was shot before or after paddock first turned his guns on the crowd. Tonight 20 20 has what no one has heard before, the voice of campos reporting the shots that fateful night. Theres shots fired in 32135. Reporter but mgm did not tell abc news the time that call came through. Im a big baffled as to why we dont actually know this is what happened. Reporter theres also an interesting detail posed by the New York Times timeline, paddock appears to initially fire just single shots. Listen. Some theories are that hes checking his trajectory or that hes firing on fuel stores at the nearby airport. Reporter the Police Response has come under scrutiny. Two officers arrived on the 31st floor at 10 12 00 p. M. One floor below paddock three minutes before the shooting stopped. I can hear the automatic fire one floor below us. Reporter why are they on the 31st floor, not on the 32nd . When you have an active shooter or a threat somewhere in the hotel you wanna block that off. Reporter seal it off. Dont let that threat or that person, in this case paddock, get outside of the 32nd floor so that mightve been what they were thinking. Come to the 31st floor. And come up with their plan on how they were gonna come up to the 32nd floor. Reporter finally, one the most troubling questions. Why did it take nearly an hour for police to breach paddocks door . Which could have been plenty of time for him to perpetrate further violence. Breach, breach, breach. The reason that you wait is because the eminent threat has either stopped or temporarily stopped. Hes not firin anymore. So at that point they were probably assembling more resources, get the right tactical gear, get the explosive entry equipment. We still dont know why paddock stopped firing, but for the first time we hear what maybe the shots that ended his life. We received another video that films that 12th burst of fire, but also what appears to be two single rounds of fire, about a minute afterwards. Was he taking one last shot at the door or outside, aiming at somebody and then saying, now its my turn. Reporter perhaps one day itll all make sense to Russell Bleck and the other survivors. Then i can hopefully get some rest. Reporter the experience has marked him for life and while theres plenty of sorrow, theres also strength. Its a constant reminder, you know . Im never forgetting what happened that day. Reporter when we come back, a new widow with her own burning question. Could the hotel have prevented the shooting . At kohls, its time to stack the savings. Take 50 off hundreds of select items storewide. Plus take an extra 20 off. Plus take an extra 10 off when you spend 50 or more. Plus get kohls cash. Plus yes2you members earn triple points. Only at kohls. If yyour todo list is crazy. Which is why the Online Finance application at carmax. Com is so convenient. Get some of that finance stuff done from wherever you are, like at the doctor, karate or. Back at the doctor. Ha ha ha, yay kids [ more more more by th more, more, more how do you like it how do you like it more, more, more how do you like it how do you like it how do you like it more, more, more im in the kitchen. 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When gunfire erupted, sonny immediately wrapped his arms around his wife to protect her. I felt the impact of the bullet in his body, cause he was holding me. And then we both went down at the same time. I just saw a lot of blood. You know, its like how can this be real . Reporter but nearly a month later, reality is starting to settle in. Heather, still coming to grips with going it alone is haunted by questions. The question troubled me the most is how did this man get that arsenal into the hotel room and nobody noticed. Reporter the hotel, the mandalay bay, is owned by mgm resorts international. When it comes to players in las vegas, mgm is a go leith, the largest employer and taxpayer in nevada. In addition to the mandalay bay, the company owns 12 other hotels in this town including the bellagio, mgm grand, the mirage and monte carlo. How big of a player is mgm in las vegas . Oh, the biggest. The biggest. The biggest Gaming Company in the world. If you were to call this a company town, mgm would be in charge of the theyd be the sheriff of the company town. Reporter but now the gambling behemoth is facing lawsuits including one alleging the wrongful death of 28 yearold andrea castilla, who was shot in the head and killed during the attack. Andrea was there to celebrate her birthday. Her boyfriend was planning on proposing to her. Reporter attorney Richard Bridgford filed the suit alleging negligence on mgms part because it failed to maintain the mandalay bay premises in a reasonably safe condition. The reality is that if these weapons are never transported into the hotel, i dont care how nuts paddock is, nobody gets killed. If they dont have breakable glass on the windows, nobody fires from the 32nd floor. If he isnt left undisturbed with his weapons. This doesnt happen. Paddock picked this hotel because he had vip status. It could come with all sorts of perks. He knew he could move across with access to the service elevator. Run up and place weapons and magazines, et cetera, ammo in his car. Bring it up the service elevator. Where the rest of us we do that, they question why do you want to move . There would be a lot of questions. Reporter remember those time lines. Whatever version of events is presented in court could determine if mgm is healed legally liable. The timeline is critical. Every minute, every 15 seconds could mean the difference in could mean the difference in millions of dollars. Reporter the Security Officer was shot about the same time as paddock opened fire on the crowd, that hasnt stopped questions about those initial inconsistencies almost two weeks after the shooting someone who could offer clarity, jesus campos decided to tell his story. He had multiple opportunities to tell his story. Reporter he was called in to help prepare campos. He chose five he was going to do and looking forward to those. Reporter just before he was about to go live on the National News shows campos changed his mind. We had a meeting and somewhere during that process, that meeting, mr. Campos and others left the room and the last word we had was they were transporting him to a quick care facility. Reporter after that campos seemed to vanish. Has mysteriously vanished. He was scheduled to talk to the networks last week. His silence has fueled much speculation about why he has not spoken publicly. Thank you both for being here. Reporter 17 days after the shooting campos along with another Hotel Employee appeared on the Ellen Degeneres show. As i was walking down, i heard rapid fire. And at first i took cover. I felt a burning sensation. Campos told his story but degeneraties never asked when h was shot, before or after paddock opened fire on the crowd. You just want this to be over, so youre talking about it now and then youre not going to talk about it again . Campos union rep says he has no idea how the interview came about. The ellen show wasnt the venue we would have chosen and that campos pannand myself invo lined up. Reporter why would camp pos choose to sit down with someone known for her jokes. Could it have something to do with mgm. There are slot machines across the country now and find them on the las vegas. Reporter it was his client who chose to appear on ellen and no outside constraints on his interview. Tonight nearly a month after being shot, campos still cannot go home. He is now being put up at an undisclosed mgm property for what his lawyer says is his own protection. This is the vaguest version of the Witness Protection Program but its their witness theyre protectinprotecting. It seems they want to make sure he isnt out there talking about the very sensitive timeline. You can understand why it might be a very good investment for them to have him squirrelled away. Reporter for heather the answers will do little to ease her pain. It will never make sense to me. No justification for what happened. And its just so senseless that i dont think you can ever get resolution in your mind. Coming up, the man behind the massacre. What drove Stephen Paddock to carry out his deadly plot . Somebody knows something and the plot thickens. Type 2 diabetes pill proven to both significantly reduce the chance of dying from a cardiovascular event in adults who have type 2 diabetes and heart disease. And lower your a1c. Wow. Jardiance can cause serious side effects including dehydration. This may cause you to feel dizzy, faint, or lightheaded, or weak upon standing. Ketoacidosis is a serious side effect that may be fatal. Symptoms include nausea, vomiting, stomach pain, tiredness, and trouble breathing. Stop taking jardiance and call your doctor right away if you have symptoms of ketoacidosis or an allergic reaction. 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Reporter he may look big and tough, but the 37year old greenfield is devastated over what happened, still trying to understand how Stephen Paddock could kill so easily. I still want to know more about paddock, and his motivation, and why, and why so many innocent people. Reporter its a question that authorities have not been able to answer so far, just as Stephen Paddock would have liked it. He loved the mystery because he was a mysterious guy. Reporter former fbi profiler brad garrett, now an abc news consultant, took us