I think he was too shocked, as he's not the kind of person to just back down. I know I can be confrontational when I'm angry, but when I'm really shocked at someone's behavior my mind often thinks "is this person for real?" As an example, I was solo diving off a boat. Got in an entanglement issue (which I resolved eventually). Saw 2 divers from the same boat. Signaled to them "problem" and "come here". They took off. Deckside one said "yeah, I saw that and didn't want anything to do with it." I was too shocked to be angry. The boat captain on the other hand.....