One thing Theo's father instilled in him is the necessity of knowing the strengths and weaknesses of any possible enemy, or even any possible ally. Well, really, just everyone. While he doesn't think that the two of them would become his enemies, old habits die hard. Besides, he might meet someone from their world who would be less incline to be friendly conversationalists. And this way he'd be more prepared than if he hadn't asked all these questions.

Paranoid?

Yes.

But, if she asks him to stop, he will. Trying to get answers out of an unwilling subject is harder than a willing one.

"That makes sense," he says with an absent nod. "People can learn to be necromancers in my world, but they won't ever be as strong as a blood born necromancer."