 SPOILER: When Nathaniel (Kelly Weaver (III) (qv)) attacks his  victim (Byron C. Miller (qv)), he smashes his victims head on the  concrete several times. For that scene Kelly was supposed to leave  his arm relaxed and let Byron use his head to provide the movement,  in order to prevent his face from actually be smashed onto the  concrete for real. Unfortunately, in several takes, Kelly forgot and  actually provided the force behind the head slamming. Byron had a  bit of a headache that night.