Leave the ruck or maul, but do not get behind the offside line.
OFFSIDE AT A LINE-OUT
There are two different imaginary offside lines for players involved in the line-out and those who are not.
Effectively they make a box which is 10m wide either side of the line-out.
Only the forwards and the scrum-half are allowed in this area until the ball has been thrown in, touched a player or the ground.
The referee will create a one-metre gap between the two lines of forwards. This is the offside line between the two sets of forwards.
Players must not encroach within this gap until the ball has touched a player or the ground, unless they are jumping for the ball.
No player can leave the line-out until it has finished.
OFFSIDE AT A KICK
If a player is about to kick a high up-and-under or a grubber kick for a team-mate to run onto, the chasing player must be level or just behind the kicker.
If they are not, the referee will award the opposition a penalty.
If the player is in front of the kicker already, they cannot get involved with open play.
Players often raise their arms when running back to an onside position.
This shows the referee that they have no intention of joining play because they are in an offside position.