I'm guessing you meant Erat.
harold, I'm pretty sure he got penalized for the late, blindside hit to the head on Ruutu, not the clean hit on Ruutu
I call BS on this idea that we have to allow hits like this as "part of the game." What if instead of saying Erat got a concussion on that play, we said he got a "life-altering head injury"? Because that's what a concussion is. Players shouldn't be subject to hits that predictably cause concussions, even if they don't look particularly dirty to us because a player doesn't throw an elbow or leave his feet. There are plenty of hits that don't cause concussions that we can keep in the game.
I know what you're saying, but I really don't think this is the same as what Cooke did to Savard. And they definitely need to try and limit concussions, it's just that they're such an unpredictable thing, I don't think you can punish guys because a hit results in a head injury. There's plenty of squeaky clean hits that could cause concussions. You can however limit the kind of headshot hits that often lead to concussions and are more about trying to brain a guy than separating him from the puck, I just don't think this hit qualifies.