Check this attempted hit by Marchand on the Canadian's Weise.
Marshand skates in from behind his target, unloads into the guy his skates leaving the ice on the attempted hit. Unfortunately for Marschand, Weise is handling the puck and has his elbow up and guess who hits the ice?
He did have a good game up to that point. Scored a goal and quite a few shots on net.
He left the game and didn't return. No release of info just yet.
Link to video:
Brad Marchand Takes Elbow To Head, Leaves Bruins-Canadiens Game (Video) | Boston Bruins | NESN.com
Edit: Scroll down to the second video from the top. The first is just a post game interview.