I guess I've been watching too many crime TV shows......
I've always thought 'Call for back-up' was standard in these types of situations.
It might be more beneficial for school LE to be trained with expert swat team training.......they are more able to pin-point an exact target without injuring surrounding victims/children.
Also, school LE should have bullet-proof vests and helmets handy, maybe stored on their mobile golf type carts while patrolling school grounds.
That's just what I'm thinking right now.
I haven't had the time to re-think my opinion.
RIP, dear children and wishing all concerned safety and comfort.
'More or less', 'Right or wrong', 'In general', and 'Just thinking out loud ' (as usual).