The second guy that got stretchered off certainly went to hospital after the game with a knee injury so that could be serious. First one was a concussion he failed the testing hence not coming back but I think he was OK. They used all 10 interchanges with 15 mins left on the clock. It came as a bit of a shock to them when the concussion became a full interchange! The rule has only been in for 2 seasons you would think they would know how it works by now.