Grip is same as Forehand, see Forehand Grip video
Grip: lightly pinch the rim of the disc between thumb, and two forefingers. The other two fingers should then pinch the underside of the rim, similar to the use of chopsticks.
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.