That's the first thing I thought when I heard school shotting. They should have ignored the order and just gone in guns blazing. You don't tell police to stand down in an active shooting. Hell stores tell you to hide if caught in store during active shooter, I think what can I use for a weapon that will kill or disable this fucker. Not sure why I think this but if I can hide in a strategic location with a metal bar and just nail him full force the shooting is over since unless he's a superman he's hurt or his weapon is broken since I'm swinging like I'm in the major league with adrenaline involved in it. I'd be scared of dying but I'd also realize this fucker needs to be taken down or out.