The production notes on these films (from Wikipedia) are a gift that keeps on giving. "During an argument with his girlfriend before production started, David Carradine punched a wall and fractured his right hand. As a result, Carradine, who was right-handed, was trained by Anthony De Longis [...] to learn swordfighting with his left hand. To conceal the cast on his hand, Carradine used a pointed black glove on his right arm while filming." #Monsterdon