20.7 WHEN THE SCRUM BEGINS

(a) Play in the scrum begins when the ball leaves the hands of the scrum half.
(b) If the scrum half throws in the ball and it comes out at either end of the tunnel, the ball must be thrown in again unless a free kick or penalty has been awarded.
(c) If the ball is not played by a front row player, and it goes straight through the tunnel and comes out behind the foot of a far prop without being touched, the scrum half must throw it in again.