It’s almost always a split second call. The officer clearly reacted to the door being breached by one of the rioters. He knew there was a group trying to break through that door to the hallway where the evacuation was occurring. When the first one actually breached into that hallway he shot. Clearly a lawful shoot. A warning would have been optimal but Babbit had heard he had displayed his weapon. The tactical error that caused the death was what I said before, the first three officers guarding the door leaving before reinforcements were in place.