The brutal retaliation took place in an Austrian pro league contest on Tuesday and involved an American player named David Samuels. Presumably frustrated by getting dunked on while his team was getting its butt kicked, Samuels connected a sucker punch to the back of Erwin Zulic's head, causing him to drop to the floor in a heap. Here's the chilling clip that makes the punches thrown in that Lakers-Rockets brawl look tame by comparison: