[Oh look! It's the beautiful, wonderful little human who had defeated him through merciful means. Mettaton's smile is saccharine, if not a little toothy.

And insincere.

He follows Frisk's signing--he's a robot, he knows many languages--and remains silent as he takes in the explanation. Hmm, so Sans was here? It's a shame he's gone. Mettaton could have used his agent. But this will suffice for now.

He has a little bit of a bone to pick with this human.]

How fascinating!! It's so wonderful to know that I'm being exposed to the surface, after all that has happened.

[The smile widens, if possible.]

Naturally, you must know I cannot stay. I have responsibilities to the Underground!! So tell me how to get home.

[Something about the way he said it didn't really sound like a request as much as an order.]