They quickly removed all the artificial green disks from every football field around the country. By doing this it gave the impression that the AFL was upset that Rehn was injured. Many people were very upset and angry to see the disks removed from the ovals because of the legend associated with them. The legend goes back to the time when Aussie rules football was first played. Those people who are very keen football followers would understand that was a very very long time ago.
Legend has it, the disks are all replicas of a space ship that once landed on an oval, in Australia.
The aliens, who occupied the ship, taught the locals an unusual game using an oval shaped ball. That game is what we now know as, Aussie rules football. Australia is the only country in the world that was shown the game. That is why the game is unique to Australia. The small green disks were a constant reminder of how the game came into being.