Sa Au is a notable figure in the realm of martial arts cinema, particularly recognized for his captivating role in the cult classic "Two in Black Belt" (1978). This film has become a coveted item among collectors, showcasing the raw energy and distinctive choreography that defined the genre during the late 70s. With its blend of action and drama, "Two in Black Belt" not only highlights Au’s talent but also serves as a nostalgic piece for fans of vintage martial arts films. Collectors are drawn to Sa Au's work not just for the action but for the cultural significance these films represent. The limited VHS and early DVD releases of "Two in Black Belt" have become prized possessions, often sought after for their unique artwork and the nostalgia they evoke. As the home video market continues to evolve, Au’s performances remain a testament to the enduring appeal of martial arts cinema, making his films essential additions to any serious collector's library.