100% agree. I can usually re-holster one-handed without looking (depending on the holster of course) so as soon as I verify the threat is not longer that, I re-holster and wait for LE.That was a question that was brought up when I was part of the Students for Concealed Carry on Campus.
"What if you are misidentified by responding LE?"
Basically the following hypothetical. Assuming an "active shooter" scenario, not robbery, of course.
Mr. Ima Bad Guy pulls Glock & Wesson XD from bag with Super Extendo magazine, starts shooting. I pull mine, shoot him. Then LE busts through the door and shoot me since I haven't had time to re-holster.
My response then, as it is now, is this:
That's horrible. And something I must be ready for as a CCW holder. I could die "in the line of fire" and it could be friendly fire. That's a risk I'm willing to take. Sure, I want to mitigate that risk as much as possible. Like Givens said, engage, verify no more threat, get gun out of hand.
I (the armed citizen - LE or not) have to understand that if I choose to respond, I am doing so to stop the threat NOW, because I am the fastest response. I don't know and can't trust that LE will bust in in the next two seconds; because it could be 2 minutes later. And two minutes could be a dozen or more people dead.
Again, all that applies to an active shooter / hostage / herding type scenario vs a simple robbery.
This assumes that I have just engaged an active shooter as you said, and not a robbery where no one has been hurt.