That seal's been under a lot of stress since getting to the Nexus, huh?
On the altar, beside the fox status, there's a little mirror at an angle. Is it reflecting the wrong face? Just for a moment?

The junior priestess isn't still right there, but she's back now. Zophiel took long enough with his honest attempt at worship that she was able to run off, ask questions, find Anchor, and come back to the Sanctuary (without Anchor, who is in fact busy).
"Is something troubling you?" The paladin has that apologetic look.