Don't get me wrong, light freediving can be fun. But seeing people in advanced classes blacking out and one convulsing is very offputting and hard to understand the fun. I know cave diving has it's risks, but if I was passing out in a cave class I wouldn't enjoy it and would probably say screw this. The classes were obviously well controlled, but they looked like barely controlled chaos. Several times the person blacking out was barely hitting the surface. It seems the margin for error was very very slim and the risk of aspiration was high.