Istredd understands possession and vessels but this sounds like something else. Two people sharing a body? Or they're mostly the same person? As long as it makes sense to Jill, it's not as if he has to understand it entirely. Everyone has their own details around here, and he finds them fascinating, but he tries not to pry past what they feel comfortable offering.

"So you're accidentally calling on it while using other magic because they're intertwined in your head." That seems to make a kind of sense to him. He gets it because he does something almost similar at times when doing his illusions, since his instinct is to use Chaos first. It can be hard to get around what feels right in your gut with magic.

"It just takes practice. At least with Academic Magic, you really just get used to learning spells themselves. They get very precise the higher up you go."