that was that and then that day the phone was ringing, and it went national, and then i believe it went worldwide. people have sent us hate mail and things like that. >> national association of karate and martial arts schools, nightingale's gym is not part of it. >> to not encourage or allow children and those under the age of 18 to participate in cage fighting, or mix the martial arts on a competitive level. >> he's an advocate of the sport, but horrified by the video. >> two children engaged in this activity, which the dangers to them. from a physical perspective and from an emotional, mental perspective. if they were wearing head guards or pads, then maybe i would say, okay, this is safe.