Initially Sam's eyebrows are raised in a bit of surprise. But Tsukishima doesn't need to explain himself. Reasons why he'd want to learn are easy to guess. He's in a strange place with possible unknown dangers.

"Yeah. I can do that." He stops and turns toward Tsukishima, placing a hand on the teen's shoulder, his tone suddenly serious, but still gentle. It's fueled by concern. "But first I want you to promise that if something bad happens, you're going to go to the Doctor or come to me, or another adult. Whoever's around. Don't just take care of things yourself unless it's an emergency and there's no one else to help. I'd like it if you made me aware even of minor injuries, just in case, but..."

He drops his hand. "I can't exactly police that. And you're old enough to make the call between something minor and something dangerous, once you know what to look for and how to look for it."

He hopes, anyway. He'll feel guilty as hell if he ever has to regret making that assumption, though.