Blue player 1 tries to get past the red defender.
If they succeed in losing their man then the attacker should have a shot on goal.
The defender should try and shepherd the attacker down the touchline and away from the danger area (the goal).
Defender should be ready for the attacker's attempts to lose them (with quick change of pace and direction) and should keep a low center of gravity and bent knees in order to be able to respond quickly to the attacker's movement.
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.