"Ow, ow, ow, ow, ow!" His hair? Really? No, no, that was uncalled for.

Coughing slightly at having the wind knocked out of him when Rude gave him the dig to the kidney, Reno coiled himself tighter around his partner, squeezing his knees tighter against his sides. However, the hair-pulling had gave him a shove over the edge and Reno sank his teeth into the nearest bare flesh, which would be Rude's head if the redhead thought he'd ever get a good bite in, but instead he opted for the neck, growling like an animal as he bit down.

Yeah, they did fight dirty.