He eyes her speculatively. "You're the real one."

"Is that your final answer?"

"Yeah. It is."

"Squint at me and find out."

So he does!

"It really wasn't. I was fairly sure it wasn't you the first time it said 'we'd have to test that,' and I was also fairly sure you were you when you asked me about ducking with my independent variable."

Snort. "Do I not say we'd have to test things? I am pro testing things!"

"Yes, but that's... in some sort of undefinable way, not really the kind of thing you'd have said at the time. I'm not sure I can tell what you would have said, and I may be completely mistaken about what's really going on in my brain, but I think it wouldn't have been that."

"Huh. I didn't conduct a parallel conversation where I said what I would have said so I guess we'll never know for sure. But you did guess right."

"Yup! Do I get a prize?"

"Gosh, what could you possibly want."

"Hmm, I have a good enough model of you to tell you apart from the bot. Do you have a good enough model of me to guess?"

"Is your model good enough to detect sarcasm?"

"Yes, I was playing along."

She snorts and starts shucking armor.

"Oh look, you do know what I'd meant."

"We're going to compare fingerprints, right? I can't do that in armor."

...he sporfles.

"I'm clockwise swirls!" She shoves her hand in his face to demonstrate and push him over onto his bed.

He's pushed over! "You know, it never occurred me to look?" he says.

So she has a look at his hands. A look, a nibble, they're so similar.

"Maybe my fingerprints are vanilla and yours are chocolate, how am I supposed to know if I don't check?" Nibble.

"You're right, silly me, we should determine this with science!"