Alright going to throw my theory out about the shoes, red cap on shooters gun, and the ear protection. All lb pb

If they are all crisis actors who signed a non disc. Maybe some are told they have to remove their shoes for the drill. (Just hold on I think I can get this to make sense) Shooter is told to wear ear protection because they will be firing blanks from close to him. Ya know its for his protection. Problem is. This is no drill. If the sprinklers come on it would be hard as hell to run on those polished floors. Makes hitting your targets a hell of alot easier. Shooter usually winds up dead. Maybe kid realizes this thing has gone live and finds a way to not get killed so he can talk. Just a theory and as plausible as anything else.