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Dean couldn't feel the vibrations of footfalls through the concrete floor down here, and he was a little startled when suddenly a hand was on his shoulder. A sharp breath in was taken, his hand blindly reaching for the arm, and he hesitated once he had hold of it.
A large wrist, someone obviously male, and they were willing to touch him on his shoulder while he was shirtless and bleeding from his nose. Either it was Sam or it was Cas, and Cas' wrists weren't this thick.
"Sammy." He grinned, reaching to find Sam's shoulder, accidentally bumping his knuckles against his face. "You're okay, right?"