Midway through tucking the folded paper back into his portfolio, Wei Wuxian makes a truly impressive face of disgust, complete with a tiny blegh at the end.

"Indeed," he says -- but already, he's brightening slowly, the wheels of his mind visibly turning. "So if there were a way to 'cook' the raw thanergy, so to speak, transforming it into resentful energy -- but how could that be done if it is unattached to the energy of the spirit? I would have to attach it somehow, and figure out a way to do it non-destructively if possible -- "

He snatches up the pen again and turns to another blank sheet of paper.