Here's some clarification for the rule, and why it's a clean hit:
Quote:
But the new wording also places more responsibility on the player receiving the hit. Referees are instructed to consider all circumstances of the incident, including "whether the opponent put himself in a vulnerable position immediately prior to or simultaneously with the hit."
Not all contact with the head results in a penalty. Referees must take into account whether "head contact on an otherwise legal body check was unavoidable."
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The head in this case was not the main point of contact, and it can be argued that the contact made to the head was due to Burrows having his head down in a vulnerable position, creating danger on what otherwise would have been a clean hit. Even Burrows admitted as much.