"Sans!" Papyrus drops a fist into his other hand, the mention of his brother finally sparking a forgotten thought.

He shakes his head as to shake off water, or forgetfulness. "That's right! I don't work for him... but I'm supposed to be minding him. And he went missing."

Admittedly, it was theoretically only for a couple hours. But between the radio silence and the sheer strangeness of the 'Sans' who showed up afterwards...