Set up as shown in video clip.
When the ball is on that players side of the court they will deny.
When the ball is on the other side of the court, the players will come across and play help defence.
Once the ball has been passed to one of those players then they will play 2v2.
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.