[Okay, yeah, it's kind of relevant information right now, maybe. (Anyway, Alphys is probably dead.)] Uh--'s amalgamation, I think. [Alphys came up with the term. Sans remembers her explanation, though it had been--uh, shaky. She'd been upset. He'd pieced more of it together himself later.] Usually it just happens if you inject a monster with a lot of Determination. [Or a monster's Fallen Down body. Sans suddenly isn't sure which of those they'd count as, technically.] Our bodies can't handle it like a human, so we, uh--

[The sharp image, unbidden, of Sans watching Undyne melting after the anomaly had struck a killing blow. No, focus.]

We melt. Can't be the exact same, but it's similar.

[Speaking of melting, Sans has lost whole shoulder socket by this point. Sans flaps his wings to try and maintain some sort of balance.]