Wtf is a nerdy usher going to do ? I guess he could have kept the door from being propped open. But then the shooter would have gonein the lobby and shot it up. Then walked in the theater and shot it up. Or usher shot 1st. Alarm ,,,,,,,,,, people would have sat around looking at the propped door. I'm pretty sure they would not scatter out of the theater due to a door alarm. Usher would have shown up to respond to the door and be the 1st one shot. Only thing that would have stopped this dick is a bullet or somebody taking him down.