"So we'll take the long way. It's good exercise." He flashes a grin, sincere but brief. There was something flat about their changes. Something hollow. He keeps his pace slow, sticking close as a concerned look coming over his face.

"You sure you're okay to leave?" He wouldn't argue, of course. It was Sans' decision one way or another. But he also didn't want to be responsible for Sans collapsing in a hallway. "If you need help, or, you need to lean on me or anything...tell me."

It doesn't sound like an offer, but an imperative.