The goalie’s knee when he’s coming out of the goal trying to grab the ball out of the air. The football referee need to decide whether he is protecting himself or endangering the opponent. Bending the knee forward as a goalie when coming out of the goal is a very common technique. A special football website for coaches says: “When retrieving balls in the air, it is a good idea for the goalie to jump with one knee pulled up in front of him. This discourages players from running into him and protects the goalie simultaneously.” And a website for goalie describes the technique of grabbing a ball out of…