this morning according to hotel staff. martin savage is in las vegas for us. martin, now authorities are openly considering that the gunman may have had to have had help at some point. reporter: right. that s at least the theory that the sheriff has. there was so much planning, weaponry, training that was required, he believes there had to have been help for some way for the gunman. meanwhile, they continue to look back at where stephen paddock has been, sort of tracing his footsteps, trying to get to the answer to the question everybody wants answered, which is why? new video shows chaos at festival exits. keep your heads down, go! reporter: concert goers fleeing. run, keep your head down! reporter: as the shooter kept firing from high above. firefighters say even the nearby airfield was used for cover. we also had people jump the fence, break through the fences, and get into the airport property. they were laying in between the runways trying to take cover