this artsi is talking about power. saying that being powerful can turn someone and make them step on other people thinking that they are above and not equal. as you can see he is blocking the water by squeezing the pipe and not letting the kid have any.
Bruce Lee - A teacher must never impose any student to fit his favourite pattern; a good teacher functions as a pointer, exposing his student's vulnerability (and) causing him to explore both internally and finally integrating himself with his being. Mart