When the ball is hit behind the line the batter is allowed to run to the 1st post but is not allowed to continue to 2nd until the ball has crossed the line back into play.
It is best that the backstop retrieves the ball and walks it back instead of throwing it back into play.
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.