I am working to find out exactly what officer did and whatever it was although probably brave was tactically deficient. Deficient to point it got him killed.
Remember that you can’t save anyone if you are dead.
If the situation requires retreat, do it!
Even if you are a cop, if you have no “firing solution” maintain a defensive posture!
It is not your fault a whacko took two hostages. Well other than the fact that you play a large role in disarming US populous.
To paraphrase Patton, who admittedly preferrred offense, you can’t win by dying. Make the other bastard die!