The way he pulls her hand while helping her up -- hard enough to pull her up, but not so hard as to hurt her -- suggests that he's stronger than he looks, and once she's on dry land he lets go and his expression turns back to its usual friendly smile.

"No need to apologize. You've had bad experiences with scientists, I take it?" His tone is gentle -- she doesn't have talk about it if she doesn't want to. "I'm Samuel Oak." He'll leave out the 'Professor' part for now; there's likely no love lost between her and academia.

"I don't have any towels, but you can borrow my labcoat until you're dry, if you think it'll help any." Running around in soaking wet clothes doesn't sound pleasant to him, but at least he has something dry to spare. He grips the front edges of his coat, ready to shrug it off at a moment's notice.