" - okay. It's important not to say your birth name, because if he knows it you're entangled. Every time he answers a question or does something for you, that magically puts you in his debt, which is a temporary kind of entanglement. Every time you do something for him or answer one of his questions, that puts him in your debt, and if the interactions even out, then you're even and not entangled anymore. I'm in his debt, a lot of debt, so I'm - I belong to him. We're entangled. Once two people are entangled, anything either of them does that the fairy magic disapproves of brings misfortune on both of them, disease or pain or death, so you mustn't do those things while you're entangled. You shouldn't lie, even a little. You shouldn't swear falsely. You shouldn't attack people whose debt you're in, though they're allowed to attack you. You shouldn't falsely accuse people of lying. And if you're in someone's debt, and they give you an order, and you refuse it, that puts you more in their debt. - I think that's most of it."