This is so bad, and proof that even if you do everything right as the good guy in a gun fight, you can still get arrested or worse. Very sad and the cop should be fired and possibly prosecuted (withholding judgement as their may be other facts not present). But as a gun owner or concealed carry civilian, people should really take the time and responsibility to properly train not just for the fight, but also for the after actions.
If the perp was down, then the owner should also have known to put the gun in any safe place other than his hand. I am not letting the LEO off the hook. Bad shoot IMO based on what is stated here. But like any accident chain, any one of several preventative actions could have brought about a better outcome.
I agree to a point. Maybe the man thought there might be others outside. But me, I am going to empty my hands as soon as I see uniforms.
In the end the cop killed a good guy. And there will be no penalty for doing so.