It’s a good question that you pose. I’ve had the stuffing knocked out of me more than once jumping back in the day, although I was among the first to wear a helmet. I’m not a flipper and haven’t experienced any serious head bangs while tricking. For me the bad trick falls are the backward neck snappers. I want to point out that one of the most dangerous of boat-towed sports, in my opinion, is tubing. The potential for head and neck trauma is very real, especially since many people ride prone and the head and neck are not supported by an erect spine.