This may have been an over-reaction by the po-po, but I watched an active shooter training presentation for work, and one of the things the speaker emphasized was that the cops will not have time for niceties while trying to get as many people out unharmed as possible. They may yell at you, manhandle you, even put you in cuffs, as the situation is resolved.
FWIW.
If the post above is correct, the active shooting had ended 3 to 4 hours previous and the shooter was dead by his own hand, having targeted one woman and one man instead of spraying out at many.
Secondly, what is the reason for breaking the doors down and making the employees lay on the floor 3-4 hours after the shooting stopped? It does seem that they were checking for any more possible shooters; but they apparently used protocols for an act of terrorism like the Kenya mall, where there had been specific threats made and chatter detected from terrorists prior to the event. But this one had all the usual earmarks of a love triangle gone bad.
I, too, have been in police training sessions, but not lately. A lot has changed; but with it, common sense seems to have gone out the window. I trust you are not in favor of the overmilitarization of the police, TSR; so I'm just clarifying my reasoning here.
I expect nothing but unprofessionalism and barely-controlled panic from our law enforcement professionals.
Possible gunfights, not knowing who the enemy is or what shape the threat could take--it's scary, and they just want to get home, right?