Let us back-up a little.....why did they not call the cops when the first incident happened?
I would not shoot someone over trashing my car and if I could get away from their threat without shooting or presenting my weapon, that is what I would do.
I texted him that question. Waiting for reply.
EDIT: At the time, they apparently thought the first encounter was the end of it. In retrospect, he says they were really stupid to think that.