There are only 3 possibilities:
1) Campos was shot before Paddock started shooting the concert attendees.
2) Campos was shot after Paddock had already shot the concert attendees.
3) Campos was shot during the time when Paddock was shooting concert attendees (in between volleys).
Campos and the maintenance guy (who was interviewed by NBC this a.m.) should know whether they heard anymore shooting after they survived Paddock’s attack. Since Campos isn’t talking and the maintenance guy did, someone should ask the maintenance guy. (I did not hear NBC ask him that question).
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.