[He shakes his head immediately at her apology; whether it's a platitude or she honestly feels bad about it, he doesn't like the idea of her feeling sorry for what she can't even help.]

It's not something you could've noticed until recently. It's... kind of a new power? Or a new way of channelling it at least... my dad showed me. Now I just have to practice it.

[Mostly true, anyway. He'll have to tell her sooner or later, but in part he's curious about how different it might feel without his fumbling explanations, and he doesn't especially want to get into it until it's dragged out of him. ]

If it starts to freak me out I'll stop, and we can do the usual thing. Promise.