Thanks for posting Dr Bill.
I do find it sad though that some divers are dumb enough or mean enough to attempt to enter the dive park with a spear gun. One of the attractions to me of the park is that the critters are semi-tame and allow divers to get closer than normal. Taking advantage of this is very poor sportsmanship not to mention the danger in a crowded location.
Fortunately attempts to enter the dive park with spears or spearguns are extremely rare. The vast majority of spearos probably wouldn't even think of doing it (well, except in their dreams). Most of the incidents I've witnessed personally were in the City waters off Descanso and Hamilton Cove, and even these were not real frequent. They often involved individuals I would not consider real spearfishers, but people out for a "lark" with a new toy.