Canadas 4-2 preliminary round game win over the U.S. womens hockey team at the Winter Olympics in Beijing on Monday left its mark on referee Cianna Lieffers.

Lieffers was unintentionally slashed across the face by U.S. forward Amanda Kessels wayward high stick during the second period. The scary moment soon went viral on social media. (Watch here .)

Lieffers, from Canada, left the ice for treatment of what appeared to be a deep cut above her lip. She returned to the ice later with a bandage.