I think you are trying to be reasonable during this discussion, but your reasons for excusing the cops actions are total BS. Just because someone called 911 doesn't justify the shooting, the choice of waiting to be shot or shot at before reacting should not be the only choice. I am certain there are other procedures in place besides, shoot first ask questions later. If he felt his life was threatened he is in the wrong line of business. I remember the female cop that shot the black guy whose car stalled said she was never so scared in her life when she shot him. She was with 2 other armed cops about a hundred feet or so from an unarmed man. If this is her most frightened moment of her life, she shouldn't be a cop.