[Sans considers it--he's fine with skimming over how he knows Alphys, of course, in favor of this. It's certainly not the first time he's tried to figure out why people here turn into what they end up as.]

Maybe 'cause you build stuff. [At home it was mostly traps, of course, but Papyrus is undeniably good at it.] And maybe 'cause you think Mettaton's cool, but probably that first one, if it isn't just random.

[There aren't a lot of spirituals at the dig site. Not a lot of scientific spirituals at all. In fact, Sans only knows of one science-related spiritual, and that's himself. So it might not be random, considering how humans approach that sort of thing. For a monster, magic is involved in everything, even science. Sometimes especially science. Human science doesn't really work as well with that sort of thing, probably because none of them have magic.]

My dreams were all about growing wings. [Which did turn out correct, he guesses, even if the exact method of growing wings was different. Of course, Sans dreamed about his scar opening up and bleeding out magic, too. That happened, but that's not why Sans is thinking about it right now. Papyrus dreamed of melting and dissolving, and besides the wings Sans's had to do with the way the anomaly slashed through his chest. So it might also be connected to their deaths somehow.]