I am not a LEO but ccw all the time. I suspect if he were my partner and drew is weapon and shot in front of me while in the patrol car, I would be disciplined for beating the crap out of him until my ears stopped ringing.
I think you would be entirely justified. I can't imagine his partner was thrilled with his reckless and deadly behavior.
I read elsewhere that Somali Noor had a couple excessive force complaints pending when the shooting occurred? And all it took for him to "qualify" for his position in law enforcement was a two year degree in hotel management? Oh, and being a special minority might have helped him along as well?