Even I have enough common sense to know if you may have children hiding from an active shooter you don’t ask them to call out.
If the shooter wasn't in the room, then where was he?
The guy overheard and he came in and shot her.
The cop barged into that classroom. The guy shot at the cop. And the cops started shooting.”
Can we count on you to provide the law enforcement agencies with a detailed account of everything that went down at that school in a written report? I don't see why not, you have all details from what you've read on the internet.
“you don’t ask them to call out”
Certainly not until you’ve killed the shooter.