Simulate defense on an imaginary offensive player who is playing the wing position.
Start our imaginary defensive position on the block playing off then toward the ball that is at the point position leading to the top of the key.
Practice using peripheral vision for this drill concentration on both the offensive player but also environment around.
Keep body low.
Feet come together but do not cross.
One arm down and in front to prevent the cross over dribble.
The other hand down and in front to prevent the pass.
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.