The change that Istredd notes extends its roots beneath the surface of Wilhelm's aspect. He's happier than he was a year ago. In his magic, he has found a sense of strength and control he never had before. In the circle of people around him, a sense of belonging. A space carved out for him despite his ill fit in this world.

Istredd has something to do with that. Istredd, who taught him to not fear the power burning inside of him, who holds a measure of faith in him despite all the times he's fucked up.

So, the least Wilhelm can do is politely nod and pretend to be interested in books about musty old wars or whatever. He doesn't care much about books, but he cares about Istredd.

"Any reason you're interested in the history of wars?"

Now that he's finished eating, he stuffs his hands in his coat pockets for warmth.