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I don't think having a concussed player on the field is much of an advantage.
Well, if by advantage you mean not having to put up with the massive disadvantage of removing key players and shuffling your team, then I guess it's an advantage. But why should the other team get an advantage just because your player got concussed? Especially if they caused it.
The HIA rule is to protect players' health, not to disadvantage his team. If the player is able to keep playing then that's his business. If he was really concussed he would be a liability.
They didn't gain an advantage, they decided against taking the disadvantage of having to take a player off the field. The player didn't do anything to deserve going off. If one of our key players got a head knock and knew he was ok to play on I would hope we'd cop the fine as well instead of losing him for what could be a pivotal moment of the game.
The NRL are just trying to cover their arses. If players didn't want to spend the rest of their lives with health issues they wouldn't be playing professional rugby league.