national and then i believe it went worldwide. people have sent us hate mail and things like that. >> national association of karate and marshal arts schools. nightingale's jim is not part of it. >> to not encourage or allow children and those under the age of 18 to participate in cage fighting especially 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 and maybe we could then say, okay, this is safe. but we've seen clear, too