Let's pretend the shooting was valid. You are allowed to use reasonable force to stop a threat. That doesn't mean death, death may happen but the force has to stop once the aggressor is no longer a threat.
Egh. If, in theory, I'm firing and I think there is a danger there 6 bullets ain't really excessive. I'm not saying these idiots were justified but there were eight cops.
If it was a valid shooting, then the number of shots is irrelevant.
8 officers and 51 shots is ~6 rounds per officer. That's not completely insane if you take into account how quickly someone can fire 6 rounds and addrenalin/the situation.
That's literally 2-3 seconds.
I'm not defending the cops one way or the other, but again, if we are stipulating that it's a "good shoot", then number of shots doesn't matter but even if it did, 51 rounds from 8 officers might be in the realm of reasonable (obviously depends on how you define reasonable).
What academy is teaching you to shoot two rounds then reassess??
You shoot to eliminate the threat. You don't shoot to kill, you don't shoot to wound, you don't aim for the leg, you don't take an arbitrary number of shots then pause.