 The release of "The Prodigal Son", along with another film directed by and co-starring Hung, "Knockabout" (1979) also shot his fellow Opera schoolmate Yuen Biao to stardom.Hung's martial arts films of the 1980s helped reconfigure how martial arts were presented on screen.While the martial arts films of the 1970s generally featured highly stylised fighting sequences in period or fantasy settings, Hung's choreography, set in modern urban areas, was more realistic and frenetic - featuring long one-on-one fight scenes.