Firefly Glen do unto others, what they have done to you

She lowered herself in the shrubbery, remaining hidden. It was only when she heard movement that one eye opened, and she noted the male moving toward the thin Uma. Uma issued what was likely meant to be a command, but the other either did not understand it or did not care. And then they attacked! The sounds of battle were loud, and teeth snapped consistently and loudly. Hydra did not intervene—this was not her fight, and Hydra was no hero. If the other got back onto their feet perhaps Hydra might learn something... but if not, the fight would be over as soon as it began. Hydra mulled over that for a moment. Then, this wolf might come after her next... and certainly, Hydra could win against it with assistance. 

It was her self-preservation that caused Hydra to join into the fight to assist the other. Quick as a bullet, Hydra moved for a rear limb upon the male while he was distracted during his assault upon Uma, tugging backward and gripping it savagely. This distracted it, but Hydra was out of his reach as her fangs pressed their full power upon his limb. There was a loud snap, and then he made an attempt to lunge at Hydra forgetting all about the wolf that had been beneath him.