[Sans shrugs again, this time a little more helplessly.] Hell if I know why they're doing any of it. All I know is the party means we get a look at who's stuck here with us without having to go door to door and with free snacks.

[And if he strongly suspects there are going to be a lot of plans for subverting this place, well, they don't have to get involved. (But he doesn't suspect they're going to openly plan murder.) Sans can make his own plans, but it's better to know what he's working with.]