Newly-released video shows the sheer panic of people as they ran away from the Route 91 festival grounds on Sunday night.
The man who shot the video can be heard telling people to keep their heads down and run.
Later, he helped load people who needed medical attention into the back of a truck.
Stephen Paddock is accused of killing 58 people on Oct. 1 and injuring hundreds.
One of those injured was a Mandalay Bay security guard that he shot through his hotel room door.
Paddock killd himself before he could be taken into custody.
