Sam had seen that look on Dean's face more than once. There was a little part of him that resented that look, because he knew that Dean was worried about him losing control or giving into darkness. It wasn't that those worries were unfounded, but Sam was pretty damn sick of always feeling unclean and like he was just a ticking time bomb.
"I'm fine, Dean," he said, his tone a little bit short but he couldn't help that just yet.
He turned his attention to the man beside them, partly looking for a distraction and partly because he was hoping he could do something to mitigate the situation before things got worse. If this was who Sam thought he was, then it wouldn't be pretty if he lost his temper.
He cleared his throat and attempted to get the man's attention.
"Excuse me. This is going to sound weird, but are you new around here?"
Sam did his best not to look like he was half-expecting to be on the receiving end of adamantium claws.