This seems to be the narrative for school shootings. They hurry to the school and wait for the gunfire to stop, then enter.
https://www.newstimes.com/.../Newtown-police-response-to-shooting-under-review-465...
Jul 7, 2013 - A team of officers that was prepared to enter the building through a rear door had to wait until a person spotted behind the school was found and determined to be harmless, he said
Sources: Sandy Hook 911 tapes reveal cops told to ‘wait’ - Connecticut ...
https://www.ctpost.com/.../Sources-Sandy-Hook-911-tapes-reveal-cops-told-to-49968...
Columbine too.
WTF! Must be standard procedure. Just confirming they are not here to protect but to investigate afterward. Hollywood has it all wrong.
If I had kids in school, I’d feel much safer with armed parents and teachers, rather than cops, watching over them.