Okayyy... That sounds like, extremely rapid, effective, healing. [Despite neither of them having magic since everything... and his brother hadn't ever really honed his healing anyway...? At least Sans looks surprised by this.]

And I guess healing... works on machinery... [Which is something of a surprise to Papyrus - there's a degree to which it doesn't feel like him, his limbs and all, still. And not just in the 'no tactile feedback when detached' sense. He gets by thinking of it all as a prosthetic covering for his body, like a cool villain injured by lava or something, during those times he doesn't want to acknowledge the dust in his bedroom. Mechanical fashion, ready to get customized now that they have a workshop and he's started making sense of how it works. (In fact, a careful look around the room would reveal a lot of spare parts and pieces of the starts of designs.)]

And, you're feeling okay? No new... thoughts, or revelations, or, uh, pains? [That mark on Sans's head-wing doesn't look like the leech spot, but you never know! What are the chances they both got burned by something in the last couple hours, anyway?]