A MARK is the location where a penalty kick, free kick, or scrum is given. Mutual Infringement refers to any incident during a match that is not previously allowed for under the Laws of the Game, causing play to be disrupted and where responsibility cannot be assigned to either party. A mark is usually taken at one of two locations: a penalty mark or a touchline mark. There are two types of penalty kicks: goal penalties and sideline penalties. In order to score a goal penalty, the ball must be placed on the ground directly in front of the goal posts. The kicker takes the penalty kick himself/herself from directly in front of the opposing team's try line and can choose to take it himself/herself or ask a teammate to take it for him/her. If the ball is kicked too high, it is considered a field goal and will always be taken by a player who has reached the end zone. Sideline penalties are used to determine starting positions after a foul. The referee signals which side he wants the ball placed on and where he wants it to be placed with his arms outstretched. The opposing teams' captains approach the referee at the mark to discuss the proposal with him. Once they have agreed, the captain of the team taking the penalty marks up to the sideline where it is to be placed while his teammates retreat 10 yards (9 m) downfield.