national and then i believe it went worldwide. people have sent us hate mail and things like that. >> joe ellis is the chairman of the national association of karate and martial arts schools, a british organization that regulates traditional and nontraditional martial arts. nightingale's gym reps is not a part of it. >> our policy is to not encourage or allow children and those under the age of 18 to participate in cage fighting or mixed 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 are dangers to them, from a physical perspective and from an emotional, mental perspective. if they were wearing head guards or pads, had access to the environment, then maybe we could then say, okay, this is safe.