The Sam part... no one had seen Sam in that last couple of seconds but Dean. Cas and Bobby were dead. No one else was there. That was proof. Suddenly Dean had a pretty good idea of what the soulgaze had put Harry through. He sincerely wanted to apologize, but he couldn't. He probably never would. There weren't really words for making someone feel what he'd felt in those couple of minutes. He knew it, on some basic level. He'd felt what it felt like to hurt the woman, the woman whose name he still didn't know. It just didn't register that that meant Harry'd see every little thing.
Highway 61 Revisited. Dean nodded. It didn't particularly mean much to him, except that John Winchester always said Mary'd been partial to Bob Dylan. Dean thought the guy sounded like he was eating marbles. He knew the words, though.
And the first things he'd said to Cas when he'd shown up that very first time drifted back into his head. All that stuff because God said so, all of his resistance. Dean nodded.
"Yeah. Supposed to be one of mom's favorites." Driver picks the music, he'd told Sam. Had he picked that, for himself?
He held his hand out for the bullet, unless Harry wanted to continue fondling it. "Sorry."
Harry gave a grunt of acknowledgement. "Gets stuck in my head every time I think about that." He pushed the memories away again, and handed the bullet back. He shook his head at the apology. "Everyone has their ways to confirm things. I figure it's better to know what to expect. My people usually want to see you bleed." He shrugged. "Most things we run into don't bleed like humans do. It's one of the easier tests. The soulgaze is another."
Along the dresser, Harry found several strands of hair. He carefully picked them up, dismissed the darker, short hairs, and was left with a few long strands of blonde hair. "A ha. I think I have a winner."