Piney wrote: I consider that past the legal (and perhaps moral?) definition of self defense and shooting to stop the threat. As one sees the BG driving off or his/her backside out the doorway- the threat is effectively stopped.
I'm not saying I would or would not have done what the armed citizen in this case did, but I absolutely disagree with your assertion in the above quoted text. Just because someone has turned and is running NOW does not mean the threat has ceased. IMO, the threat has not ceased until 1 of 2 conditions have been met:
(1) the threat is GONE
(2) the threat is no longer moving
IOW, so long as they are still present and moving, they are still a threat.