Oh so true! LEO can't be expected to sort people out during the call.
Our school district just conducted a staff training exercise for the possibility of a "burglar" attacking any of our buildings. Active Shooter is now a passé term. A burglar is anyone who is in, but does not belong in the building and is in process of doing mischief.
Our police responders are being advised and trained to neutralize any weapon... using common sense, but extreme prejudice is a very acceptable and reasonable option. They're priorities are simplified.
That kind of trumps the NRA concept of putting CCW holders in the classroom. LEO sees a gun and regardless of good guy-bad guy, there's a great likelihood of someone getting shot in that highly charged environment.
Still not a good solution, but in such a case, arms away from the body and fingers spread will keep you safer from friendly fire.
