Silly me, i believe in the rule of law. The limits of legal self defense are defined in law. They dont include shooting people who are fleeing from a minor crime.
My point being is at what point are you sure they are fleeing, 5 feet, 10 feet, there is a distance but what is it coupled with behavior - head down running or circling around you still in a group. Typically if fleeing roaches scatter not stick together.
Basically a moot argument until you are there, ala shades of Zimmerman.
Do not discount the mindset of the victim during this crime.