Abby makes a mental note to say the term 'magic gash' unprompted to Gwenaëlle at some point in the future. Then, misunderstanding his point, she huffs. "Really? You're gonna go for 'you're a woman, I'm a man'? You can be more creative than that. You don't have to admit you're actually a demon if you lose, either."

So give her something to work with.

She prompts, "We've both cracked other people's kneecaps before."

Point of similarity. Not so hard.