"You know your dad..." He smiles back to the Doctor, then shifts his concentration back to Jenny, hoping she'll actually listen to him instead when it comes to this. "He'll let you take too much, so let's not let him go too far. You can draw from me all you need to, Jenny. I've got plenty to spare and I'll recover from it anyway. He's your dad, but I'm very motivated in a different way than he is. The Master tortured me, too."