*An umpire can pay a free kick if a player drags the ball under his opponent, or if a player holds the ball in when an opponent is trying to knock the ball out.
Next year little Adrian will trial a free kick against the player preventing the opponent not trying to hold the ball under his opponent who is not trying to hold the ball in.
The year after little Adrian will trial a free kick against the player preventing the opponent preventing his opponent not trying to hold the ball under his opponent who is not trying to hold the ball in.
The year after that little Adrian will trial a free kick against the player preventing the opponent preventing his opponent who preventing his opponent not trying to hold the ball under his opponent who is not trying to hold the ball in.
etc ...
Just ball the bloody thing up AA like we have for the past 150 years
*A free kick is paid against the team which last kicks or handballs the ball over the line, provided no one else touches the ball before it goes out of bounds. Players walking the ball over the line are also penalised.
This rule never works in Aussie Rules.