After Las Vegas massacre, trying to move forward

As authorities piece together the shooter's final days, survivors start the healing process and parents of an Aurora shooting victim are in Vegas to offer their help.
7:52 | 10/06/17

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Transcript for After Las Vegas massacre, trying to move forward
I would have given my life in a heartbeat and taken his place. Reporter: For Cameron Robinson's family, the horrible reality is just starting to set in. Part of my heart and soul feels like it's been ripped out, taken away. I'll never get that back. Never get my brother back. Reporter: Four days after he was gunned down along with 57 other concertgoers, this is the view from above. When you look into those fairgrounds you see the evidence of that family-friendly festival, you see strollers and walkers. That Las Vegas fairground is still an active crime scene. Right now there's still FBI forensics teams combing in groups through that fairgrounds. They're trying to make sure they don't miss a single piece of evidence. Go, now! Run! Reporter: That field became an indiscriminate killing ground. With the gunman firing from the 32nd floor of the mandalay bay across the street. Everybody go! Reporter: No one was safe. Stay down, run this way! Reporter: Bullets raining down. In the aftermath, new video showing the chaos on the ground. That gunfire triggering hysteria, confusion. Run, don't stop! Run, don't look! Reporter: Police officers screaming to those concertgoers that they are under attack. Everybody go! Let's go! Reporter: This video shot by ray page, who went to get his truck parked nearby, driving it back into the kill zone, turning it into a makeshift ambulance. Right here, come in here! Reporter: The wounded loaded in one after another. Do we have any other wounded people to take? Not right now. Reporter: Ray jumps behind the wheel, drives down the strip, bringing them to paramedics. I got five wounded! Gunshot wound in the chest here! Reporter: Law enforcement caf vaging for clues to how 64-year-old Stephen paddock pulled off a mass killing of this magnitude. It's troublesome that this individual was able to move this amount of gear into a hotel room unassisted. Reporter: At least ten bags stuffed with 23 guns and stockpiles of ammunition found in his mandalay bay hotel room. But how did no one notice? The sheer volume of them, you couldn't even shoot that many weapons. Reporter: What's more, he may have planned to launch other attacks. Law enforcement officials tell us paddock scoped out these two buildings to possibly rent a room just before the life is beautiful concert. They would have offered him the same type of field of fire right into the main stage and a crowd of people, tens of thousands who would have been absolutely penned in. Police now say paddock may have also scoped out other cities, possibly targeting Fenway park in Boston and the lollapalooza festival in Chicago. As a result, police tactics across the country may need to adapt to this new kind of threat. I think what you're going to see is that if anybody else is going to have an outdoor concert that's in the proximity of buildings that are above the concert, they're going to have to put uniformed officers with sniper rifles on the roof. Reporter: Days into the investigation, the shooter's motive remains a mystery. But authorities have ruled out financial problems, and they hope paddock's live-in girlfriend, Marylou Danley, can provide answers despite repeated denials about knowing anything of his plans. Danley was with paddock when he bought this ka are in Reno, paying for this with this check of over $14,000. She said she had a bad relationship prior to him and he had turned her life around, really helped her out. Reporter: The FBI asked dealership employees about the purchase. Marylou wanted to get a Lexus. But he was like, I'm not going to spend $10,000 more for a car that's got the exact same equipment. Reporter: Over two weeks ago paddock sent Danley to the Philippines and wired her over $100,000, she says for a new house. Authorities are also investigating his alleged contacts with a different woman shortly before his ram page. After each of these massacres, conversations about new gun regulations have been raised and then dropped. But today the political winds may be shifting. At issue, the bump stocks attached to the assault rifles used by the Vegas gunman. These bump stocks allow the gun to be fired continuously, mimicking an automatic weapon. This video showing a bump stock in action. Earlier this week, president trump said it wasn't the time to talk about gun control. Mr. President, does America have a gun violence problem? We're not going to talk about that today. Reporter: But on capitol hill, Republican congressman Carlos carvelle from Florida plans to introduce bipartisan legislation banning bump stocks. The goal is to prohibit these deadly devices that caused so much death and destruction in Las Vegas earlier this week. Most members on both sides of the aisle agree that this is a blatant circum vention of the law and we want to close this loophole. This has the potential to be a major moment. No gun legislation of note has passed in decades in congress. The fact that you have bipartisan interest, and even minimal changes to the nation's gun laws, that registers as a big deal even if it's nowhere near gun control advocates' dreams. Reporter: The president of the national rifle association says it's worth reviewing bump stocks' legality. The NRA has said, we ought to take a look at that, see if it's in compliance with federal law, and it's worthy of additional regulation. That being said, we didn't Saban, we didn't say confiscate. Reporter: Even president trump may be changing his tune. We'll be looking into that over the next short period of time. This issue has come to the forefront. And there's no avoiding it for the white house. And that's why you see the white house now saying they want to be part of this conversation, they want to engage in the conversation. Reporter: This latest massacre all too familiar for families who have lost loved ones in similar horrors. They've come to Las Vegas to provide support. If you were there at the shooting -- You're traumatized. I don't care if you were hit, I don't care if you lost a loved one, if you were there, you still were traumatized. Reporter: Lonny and sandy Phillips lost their daughter, Jessica, in the 2012 Aurora, Colorado, movie theater shooting. You look at those numbers and you know what some other mother is feeling at that very moment. And you have walked in those steps. You know what another father is feeling, a brother. Children. Who lost their mother and can't possibly wrap their brains around what has happened. And then you get angry. And then you take a deep breath and you go to work. Reporter: That's what they did, banding together under the name survivors empowered, and offering empathy to victims' families. We tell them up front that we're not here to provide any kind of mental health services to you, we're here just mother to mother, father to father, sister to sister, and help you through that initial shock of what you're experiencing now about and what you're going to be experiencing the next few months. Reporter: Around the country others are looking for ways to pitch in. The Las Vegas victims fund has raised more than $9 million in just three days. But it will take more than money to heal the wounds here. For "Nightline," I'm Matt Gutman in Las Vegas. Indeed. And "20/20" will air a special documentary presentation with brand-new first-person accounts on the heroism amid the tragedy. "What happened in Vegas" airs tomorrow at 10:00 P.M. Eastern, 9:00 central.

This transcript has been automatically generated and may not be 100% accurate.

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