Looked pretty full-force to me 
Good stiff boot to the head Big Chiro Flex-style.
Watch just before impact she bends the knee, doesn't plant her left foot and actually jumps right before impact, turns it into a leg kick instead of a full body, punt your head across the arena kick. Plus the chick that got kicked jumped right up and walked to the side.
Still decent though and bitches get crazy in sports, way worse than guys.
LOL, if you watch the video, the bitch in white kicks her leg out from under her.
