This is interesting, https://www.today.com/news/las-vegas-hotel-workers-took-cover-hallway-after-gunman-opened-t117342
“Schuck said he radioed for help once the shooting did stop, ran down the hallway and took cover with Campos.
Audio obtained by NBC News also indicated Schuck alerted his superiors that Paddock was firing some 200 rounds within the hotel hallway.”
Schuck was the maintenance worker who first told hotel security to call the police. The link above has a link to the actual audio and you can hear some of the first shots fired in it.
How are those two guys not shredded after he shot at them down a hallway?
To me Schuck makes it clear that he is saying the shooting of the crowd happened after the shooter fired on him and the security guard.
Schuck calmly called for police over his radio. The gunman eventually turned his attention to the country festival taking place below him outside.