Negative @ 36: and 38:
Negative for a shooter inside the tropicana casino, the medics were shot at outside. This isn't a civilian calling 911 saying they heard gunshots. It's medical responding to a gunshot victim telling dispatch they're being fired upon at the scene. If nobody was shot at the tropicana why were medics there? Why was SWAT carrying a stretcher when they arrived if a shooting didn't take place?
You will also notice head of secuity and plain clothes at the rear. Both of them break off from the team, notice the bag the plain clothes is carrying.