The situation got away from them? I guess that's the nice way to say the, "Jogger" went out of his way to physically attack and attempted to disarm the neighbor!
No, to me it looks like they challenged him. He wasn’t a neighbor...neither of them lived there. Then he got scared because of the shotgun and tried to get it away from them. Also, they had a history and he had had run-ins with the older man (the father).
In any case, it was an accident that he got shot, but they shouldn’t have been doing this armed patrol on their own initiative anyway.