"Hmmm. It's a fair question," Papyrus mulls it over for a moment. "Before he fainted... he said he needed to check on something, and started walking this way. Even though he really couldn't walk well." The supportive bone dogs, making such a point to be at his side for him to nuzzle him and maybe let him lean on them, could attest to that if they were following the conversation.

"I think he'll freak out no matter where he is. But, he'll recover faster if he recognizes where he is! Somewhere familiar and comfortable seems best. Doesn't it?" He's genuinely asking, still holding Sans rather than dump him and run. This is, after all, Amethyst's home space too. Nobody wants their home getting wrecked.