So she'd seen those images the house of mirrors had projected and offended Lucifer. She's really lucky then, though he can only imagine what had been shown in those mirrors. His frown deepens, tossing several thoughts about before he finally settles on one.

"He's an angel cast out from Heaven. I would imagine Hell isn't so kind to those that end up there." Not in the sense that it saves an angel from the torment, but he says it politely. Castiel knows that it isn't kind to anyone. He'd been there, after all. Still--

"You should have it looked at before it gets worse." By someone who can actually do something to fix it.