[ There's another long moment of silence as Castiel tries to puzzle through the latter half of what House just said. More references? Is he speaking in tongues? He just doesn't know. ]

If you could see it and she could remove it from her person, it was probably a fake. I don't underst- [ He cuts off abruptly as a realization strikes him. Castiel didn't recognize the figure at first, not being used to perceiving them with only mortal sight to rely on instead of his full array of senses, but now that they're closer it's unmistakable. ]

Stop. [ His voice is a low hiss, suddenly concerned about being overheard despite the distance. ] This is someone I know.