The Army teaches infantry platoons to rush a close-proximity ambush. It is counter-intuitive to say the least, but I presume they know what they are talking about, and that refers to being outdoors. Inside, where the shooter is very close to his targets, rushing him should work even better. If the nearest three or four guys would just rush the shooter as soon as he started shooting, one of them would probably get his head blown off but the death tolls from these events would be just that one guy, instead of several more. Obviously, no one knows what they would do until they get in that situation, but I wish that schools would come up with a drill for a school shooter. We have fire, earthquake, and tornado drills in schools already, yet those events have not killed any students lately. I doubt shooter drills would happen, because it would be admitting we have a problem, but if they taught people to tackle that mother fvcker instead of fleeing in mass panic, I think that would prevent some deaths.