The lacerated Achilles tendon that Norris Trophy winner Erik Karlsson suffered on Wednesday night in Pittsburgh is among the worst nightmares for any hockey player. As dangerous as the game can be, it is never more so than when the razor-sharp blades attached to players’ feet wind up where they do not belong.

Karlsson, 22, will miss the rest of the season with a 70 percent laceration to the tendon, the Senators announced on Thursday. He was cut by Penguins forward Matt Cooke's skate on an otherwise innocuous second-period hit.

“You try not to think about it,” New York Islanders winger Matt Moulson told Sporting News earlier on Thursday. “We’re skating out there, going however fast, and you’ve got these sharp knives on your feet. Sometimes, something unfortunate happens. It’s a scary thing, but as an athlete, you’ve got to put it out of your mind and take the best precautions you can.”

In the case of what happened to Karlsson, that means wearing special, cut-resistant socks. Moulson said he has gone back and forth between wearing them and not, but “when you see something like that, it definitely encourages everyone to wear them.”