Yes.
Then they both go out of view. When they come back in view Hall is backing up and the dog is moving quickly towards him.
Hall's positioning itself would make that impossible. What you're saying is Hall backed out of view and then "backed" back into view?? Have you read the internal investigation report? Which direction is Hall headed in the instant the dog leaves the car?
I am not going to argue the facts of this clip. That's for lawyers if this gets that far. I see from the clip Hall moving into view of the camera from his right the instant the dog leaves the car. (More sideways than backward.) I then see him step forward with his gun leveled on the approaching dog. The dog falls.
Short story: one....two....boom.
Yes, just watched it again, he backed into view. I never said he backed out of view, it's not very clear. It is pretty plain that he is backing up as he shoots the dog. You can't seriously argue otherwise.