"Where did I go wrong?" Jeffrey asked, as he sat in Hell with his demon idol.
"Where did you go wrong? Where didn't you go wrong? First of all, you should have had a bomb at the library, so you wouldn't have had to worry about Sam. Second, you should have made sure Dean didn't have any weapons on him while you were tying him up. Third, if you wanted to make sure I went into you, you should have put an anti-possession charm on your hostage. And you should have checked the room for devil's traps before you summoned me."
"I have no idea where that came from. It wasn't there before."
"Then you obviously let one of the Winchesters paint it."
"No way. Dean was only in there for about a minute before I knocked him out and Sam didn't even know about the place."
"Nora, then."
"You really think she came in and painted a devil's trap and left her son there? Now who's being stupid?"
"Well, then, how did it get there?" the demon demanded an explanation.
Jeffrey didn't give him one because he didn't have one.