I found this clip from the little-seen 1981 karate film Kill and Kill Again on Youtube. It features real life karate experts Malcolm Dorfman and Norman Robinson. Robinson played the character “Gypsy Billy.” Kill and Kill Again was a sort of sequel to the 1976 film Kill or Be Killed (a.k.a. Karate Killer), which I still have on VHS. Both films starred karate expert James Ryan.