“...There is no legal requirement for a person to stop and respond to someone who is following them. Sure, responding to the threat of someone who is armed from the outside might be perceived as the aggressor; the statements from the pursuers state they initiated the encounter.”
*******************************************************
I agree with your first sentence. However the “encounter” was strictly verbal and was not physical until the runner suddenly charged the son and attempted to wrestle the shotgun from him.
The drivers admitted to already cutting off the dude. He had already turned around and was fleeing the vehicle filming.