There are many questions an umpire must consider when interpreting holding the ball situations.
Training package for Australian football field, goal and boundary umpires
Education programs supporting growth and development of female umpiring
Drills and skills for boundary umpires including the important boundary throw in
Laws of Australian Football as administered and controlled by the AFL
Training sessions and skills for field, boundary and goal umpires
The AFL's National Umpire Uniform Supply Program