This is pretty easy to determine. How many of the Celtics free throws were off of FG attempts vs. bonus related? Boston was getting shut down. They weren't the aggressors, we were. This game actually make me rethink my theory on HCA. I just figured that the margins were caused by unconscious helpful reffing to the home team. After seeing this, I think the HCA must be cause purely by crowd noise helping addreniline, and familiar visuals in the home arena.