The Dark Sides of Martial Arts Training

"It was interesting watching in this first week how some of the people who are not used to this kind of training, I could see the dark sides of their nature coming up," he says. "So we sat down and we talked about it and we chat about it and say, look, this is what's going to happen." He adds: "I think an important part of martial arts training is to ... not berate people for that... isn't it the stereotype?"