With Bahktiari, its more than just the turf. He also isn't practicing on grass. Lafleur could've just said in the press conference after the game, that Bahktiari is sitting out turf games and practice due to knee swelling. The fact he became angry leads me to believe that its more than just a medical issue and he may be questioning his commitment. If that's true, which we don't know, then he needs to be traded immediately since a lack of commitment becomes a cancer on a team. If the knee is frequently swelling, then his sitting out the last game makes some sense.