Makes me wonder why the police officer was so quick to react to what would appear to be somebody emerging from his house. If one was in a clear state of mind then one could expect a homeowner to investigate any loud noises that might be occurring in the backyard. Most gun owners would choose to investigate such noises with the aid of a firearm.
I'm sure the police officer who shot the man was pumped up on adrenaline and wasn't able to figure out that the other officers were probably safe despite the presence of an unknown man with a gun. Not sure why the homeowner didn't turn on any backyard lights or use a flashlight to see what was going on before he emerged while armed.