The credits of Bush Mama (1976) list Haile Gerima not as director but as “answerable,” a welcome gesture of responsibility from a filmmaker and especially admirable given the film’s incendiary nature. Shot in black and white as Gerima’s thesis film for UCLA, it follows the slow but steady political radicalization of a young woman in Watts in the bitter ruins of the black power movement. Bush Mama was a key film of the LA Rebellion, an explosion of Afrocentric filmmaking that came out of UCLA in the 1970s and ’80s, which is being showcased in periodic retrospective screenings here through early June. This Thursday, Gerima (who’s been teaching film at Howard University since 1975) appears at Logan Center for the Arts to be interviewed by Jacqueline Stewart of Northwestern University and to revisit the film that made his name.