Here's a newsflash for those who admantly disagree that all head shots...accidental or not...should be removed from the game, for fear of losing good, clean bodychecks: hitting is already leaving hockey. It's not the rules-makers doing it, either. It's the guys on the ice; the players and referees themselves.
The Canadiens lost to the Rangers because Mike Blunden laid a solid bodycheck and the Rangers, as so many teams do these days, took exception. In the unjustified scrum that followed, the Habs drew the short-handed straw and lost their fourth-line centreman. The Rangers scored on the 5-on-3 and that was enough to get them rolling. Without a fourth line, the Habs played catch-up all night and, despite showing lots of heart (when they weren't in the box), they couldn't quite make it all the way back.
We see this so often. A perfectly legal check, intended only to remove the puck from the puck carrier, triggers foolish and unwarrented retribution. Players say they want hitting in hockey, but when someone actually delivers a good hit, they take offence. There was no reason for the Rangers to get all up in arms over the Blunden hit. When they did, the refs shouldn't have fallen for it and punished the Canadiens with the extra penalty. They shouldn't even have called the first penalty. They called the Blunden hit interference, but the definition of interference is "impeding the motion of a player not in possession of the puck." The Ranger player had the puck when Blunden hit him, which made the check legal.
In the end, it didn't matter. The refs called a lot of borderline penalties on the Canadiens and not the Rangers. That's the way it goes sometimes, and you can give the Habs kudos for pushing back. It's just too bad a good effort was spoiled because the Rangers can't take a check.