Okay, your school point finally gave me a useful reason to detect a brandished firearm. There HAVE been a handful of videos we've all seen where the AS/AK gets all ready out of sight, but on camera. Having that go "maybe gun!" to an operator who then looks, agrees, then is able to sound the alert even a few seconds early might help a lot.
But... pretty rare cases. Would have to be somewhere it's super not good to have a gun, where no good guys do carry them, around so it doesn't do functionally false positives and: we incresingly suck at the whole human in the loop part, with untrained folks, who have no authority, or just deciding to save costs. If implemented I see this being abused sometimes and then totally misused so it doesn't help at all where needed. We'll be reviewing post-event video where the recording says "I think that's a gun."