ankle-tap). Tacklers may not tackle an opponent who has jumped to catch a ball until the player has landed. Rucking and Mauling Mauls occur after a player with the ball has come into contact with an opponent but the handler remains on his feet; once any combination of at least three players have bound themselves a maul has been set. A ruck is similar to the maul, but in this case the ball has gone to ground with at least three attacking players binding themselves on the ground in an attempt to secure the ball. Set pieces Lineout When the ball leaves the side of the field, a line-out is awarded against the team which last touched the ball. Forward players from each team line up a metre apart, perpendicular to the touchline and between from the touchline. The ball is thrown from the touchline down the centre of the lines of forwards by a player (usually the hooker) from the team that did not play the ball into touch. The exception to this is when the ball went out from a penalty, in which case the side who gained the penalty throws the ball in. Both sides compete for the ball and players may lift their teammates. A jumping player cannot be tackled until they stand and only shoulder-to-shoulder contact is allowed; deliberate infringement of this law is dangerous play, and results in a penalty kick. Scrum A scrum is a way of restarting the game safely and fairly after a minor infringement. It is awarded when the ball has been knocked or passed forward, if a player takes the ball over their own try line and puts the ball down, when a player is accidentally offside or when the ball is trapped in a ruck or maul with no realistic chance of being retrieved. A team may also opt for a scrum if awarded a penalty. A scrum is formed by the eight forwards from each team crouching down and binding together in three rows, before interlocking with the opposing team. For each team, the front row consists of two props (loosehead and tighthead) either side of the hooker. The two props are typically amongst the strongest players on the team. The second row consists of two locks and the two flankers. Behind the second row is the number 8. This formation is known as the 3–4–1 formation.