in a crowded auditorium, the crazy bastard has the high ground (the stage), an open field of fire, and several weapons. You have no idea when or if he will need to stop and reload (at least until there is a lull in the shooting). Let's say a student has an (illegal) j-frame in his pocket. Should he take cover behind a seat, wait for the lull, then stand and fire a with his snubby at 100ft? Wait for the lull, then charge the stage and hope like hell you can get there before he gets another loaded weapon in his hand?