I was at the game, and sitting right next to the habs bench. He was limping pretty badly on his way to the dressing room when the game finished. He couldn't stand on his two feet, and was hopping on one leg (helped by someone). He looked like he was in considerable pain, did not look good at all.
Don't be surprised if the injured player is Pyatt. On the play where O'Byrne cross checked Brassard leading to the Lapierre goal, Brassard fell forward into the knee area of Pyatt who looked to be in considerable pain, skated off and didn't play a shift afterwards. I'm surprised nobody caught that, specially the commentators.