I look at multiple targets as multiple single targets.
What that means is, each target gets shot at once. The targets that need a second shot are then shot a second time. After that, it's one shot per target, of those remaining targets that need to be shot again.
Chances are, and I think Goetz's shooting showed this to a degree, when you start shooting back, badguys tend to turn from the fray and try to vacate the area. Goetz's shooting of a guy turning proves this to me.
I will not comment on Goetz's legality, plans or fleeing the scene as I was not there and have no investigative knowledge of the incident. I will say, shoot each target once and repeat as needed.