Suppose you have hiked 10 miles. You are a 60 year old man and you are tired. You are wearing a pack, so you can't run.
A man is running at full speed towards you screaming, "I'm going to fucking KILL YOU". His fists are raised. You have a gun in your hands. You have already shown the man that you have a gun. He's still coming, not slowing down. He says he's going to kill you. You can't believe he doesn't stop. You can't run. If he reaches you, he might kill you with your own gun. What do you do?
Love that speculation!
He had a chance to shoot the dog. He choose to shoot the dog owner instead. Get a rope and hang em.