"Huh." Dean sits back a bit from his reflexive lean to brace his elbows on his knees where he's sitting on the edge of his bed, features thoughtful. He doesn't look in the least confused, at least not with the basic premise of Titus's tale. He looks like he's flipping through a mental rolodex of possibilities - which is exactly what he's doing.

"And you're sure you didn't smell anything? Nothing like rotten eggs, or... like... you know how everything smells after a bad storm? Nothing like that, not even a little? Take a second and think about it." He glances at Sam, giving the slightest shrug; he doesn't know.