The director of Lees film titled Talk To The Fist is Canadian film industry legend Don McKellar, who once starred in David Cronenbergs 1999 videogame-horror film eXistenZ . Hes the guy whole interrupts for the action call. The first assistant director on the film is Walter Gasparovic, also the 1st assistant director for the actual film. You can hear him on the bullhorn after Wallace yells fight.