She's important to him, maybe even more than Istredd. She was in the Cage with him, even as a nightmare, putting up with his bullshit in stride and then continued to be an odd figure shouldering besides him, understanding in a way that most have no means to achieve.

She doesn't realize how important she is to him and he has no way to understand she might need it.

"Well that's nice," he says blithely. "Do you know which Old God? I don't know enough about them." He'd probably incur judgment normally but he recently, with Yennefer as an actual battery, had to invoke an Old God to break down a High Magic illusion so he's feeling less uppity about all this pagan bullshit coming out of Solvunn.

Oh, it's still bullshit, of course.

But he recognizes he has to use it.