In soccer it is a convention that you kick the ball out of bounds if an opponent has become injured; thus you stop the play. When play resumes, the attacking team is expected to give the ball to the defending team as a mark of good sportsmanship. In ice hockey you must not “spray” the goalkeeper with ice using your ice skates; if you do, you will likely attract the anger of the goalkeeper’s teammates. In a track running race, it is expected that you are two strides in front of a rival before you move directly in front of them (i.e. you are not allowed to interrupt the stride of your opponent).