The expectation of the behavior of the skipper will be different if he knows that he hit the mark vs not knowing.
Thus, a sidebar chide might be in order. "hey Bro, did you know that you hit A mark in the last leg of the 3rd race, you now owe me a beer to exonerate your self"
This is precisely why you should hail "protest" at the time of the incident. That lets the boat know that you saw them hit the mark and gives them an opportunity to exonerate themselves while racing. That is a much better result than either RAF or rancor in the bar.
Sincerely,
Eric
