Reminds me of my daughter playing Midget U17 boy's hockey...
Normally, she fought with her brother as siblings do (he's 1/2 cm short of 2m; 125+kg); she's just under 1.8m. At the game in question, a boy, about 1.6m tall, on the other team came up behind her and pulled on her ponytail.
She turned around and hit him once. That would have been the last thing he saw before she laid him out on the ice.