The cat has more teeth and claws than Bruce. It also has fewer morals, fewer inhibitions, and less restraint.

Bruce... growls in irritation at very literally finding the cat between them. The cat seemingly does not care, in the least.

"He's obnoxious, but he doesn't talk." Just being clear while... petting the cat absently, rather than immediately following through with his intent to scruff and remove it.

The cat, on it's part, lowers itself down into a loaf, and reaches out one paw and pats Zerxus' cheek. Claws retracted. Still threatening, somehow, given the aggressive eye contact.

"...at least that I've heard." All things were possible when the Lord of hell was your father , and no evidence was concrete evidence.