I've been taught that justification requires certain elements. The names may change, but the basic ideas (per Massad Ayoob) are:
Ability - the BG must have the ability to inflict death or great bodily harm;
Opportunity - the BG must be in a position where you could reasonably believe he could employ the aforesaid ability; and
Jeopardy - the BG must show manifest intent, via words or actions, that he intends to inflict death or great bodily harm.
In this case, the BG was running away. I don't think Jeopardy was in evidence, so I think it was a bad shoot.
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