He was wearing full body armour. He had tickets to the movie and left the emergency exit door ajar at which time he left, pulled his car to the back, donned body armour, a gas mask and possibly a helmet. He burst through the door and threw smoke or tear gas into the crowd and commenced firing.
As a CCW holder, I wish I were there to shoot him in the throat, but as I mentioned before, they may have a no carry policy there in that theatre. The cops did a great job getting him into custody as soon as they did, but the damage was done by then.