"Yeah, bet it's a lot, huh? And the trees are all wet now..." Sans doesn't really have much firsthand experience with keeping a fire going, but you don't spend years living in a snowy (underground) forest town without getting some vague idea of how it works. And he knows it involves dry wood. Sans is quick to take up as many blankets as he's offered. His legs are starting to itch. Why are his legs itching? This is awful. "There's gotta be someone selling firewood, right? 'Course, that's probably expensive."