Playoff hockey is dirty as hell. Here is an elbow to the back of the Penguins' Kris Letang's head by the Lightning's Ryan Callahan. Because it's playoff hockey and that's what happens.
Letang's head was smashed up against the glass and he was slow to get up. But he did return, because hockey is working on the NFL's 1980s concussion protocol. You know smelling salts and answer a couple of questions. As long as you're not sleeping you're good to go.
Even though everyone thought Callahan would be suspended, word has come out that he will not. Anything goes in playoff hockey.