Trained from childhood by his father in the Cantonese opera, Leung Choi-sang-who performed under the name Bruce Leung Siu-lung-mastered Goju-ryu karate while also studying Wing Chun, laying the foundation for a prolific presence in Hong Kong’s martial-arts cinema. During the 1970s and 1980s he appeared in a steady stream of productions, notably choreographing the fight scenes in Jim Kelly’s The Ta…