This is from an international tournament in Budapest, Russian Svetlana Starovoytova literally breaking her stick over the head of American Hannah Bates. That's bad.
Puck Daddy has some backstory, including what you don't see in the video:
Starovoytova was thrown out of the game, and not a moment too soon. This chop was actually a follow-up slash, as this video begins with Bates down on one knee, reeling from a previous slash to the lower back Starovoytova had given her a split-second earlier.
Ah yes, the hockey double tap.