When the NHL resumes its deliberations on what will constitute an illegal hit to the head next season, the one above by Toronto’s 6-foot-4, 243-pound defenseman Mike Komisarek on Colorado’s 5-foot-10, 170-pound rookie Mark Olver will be among the most contentious types of blows. It left Olver trying to crawl off the ice, weakened and apparently dazed, unable to make it back to the bench. He left the game and did not return.

This was not an illegal check under the current rules. But it is a perfect example of the challenges the NHL faces as it mulls the changes it needs to reduce concussions.
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