"'M human. He was supposed to catch me." Or kill them, but they're not about to say that. "And he did, but I got out a lot, too. We ended up making friends instead of being enemies. Did with Undyne too. We were all friends."

They go a little quieter. "Yeah. He...met a human that was...worse than me. That hurt a lot of people." Who also killed him, but they definitely don't know that part yet.

Frisk doesn't know what to think of that, and they tilt their head quizzically. How can he not know what his Sans is like?