The person on the side of the mats feeds the ball to the two players who communicate pass the ball to the net for the ball to be set up for an attacking jump-volley to the mat that has not been occupied by the feeder. This means that the attacking player needs to work on creating a good field of vision and observe where the feeder has moved to.
World Rugby has reportedly conceded Aaron Smith's disallowed try in the World Cup final should have stood.
"It is not only useful for staff who are experienced but a valuable tool for those subject staff who have to take teams."
The variety of sessions across sports - sometimes we steal session ideas from one sport and use them with another.