We didn't do much to convince it beyond... engaging in more physical contact than usual.

[Castiel shrugs and takes another bite. It seems they'd done their job well enough, even if not all that much had been different.

Though it could also have been a matter of Dean being in the wrong place at the wrong time.]

Dean went to the restroom, and that may have been where it targeted people. [That would hardly be the first time. Ghosts seem to enjoy terrorizing people in bathrooms.]