I understand and it takes a lot of training to do that, but, as you know, most civilians with no training act on emotions, very dangerous situation with a dedicated shooter. Those poor kids probably were shot and killed within the first 2 minutes when the perp entered the classroom. Unfortunately very little could have been done to save them.
How the hell would they know? If they actively engaged the shooter as soon as they were on scene, the shooter would have been busy dealing with attackers, not idly murdering unprotected kids.
Just damned cowardice. They’re not police - they’re just meter maids with snazzy “combat” uniforms.