I don't think anyone has messed with Harry's head in Peace Talks, I think what is happening is he is being hit from all sides at once and he is trying to regain his footing so he can fight. He did have his priorities, 1] get little Maggie to safety,2] get Thomas to safety.. Once that was done, the decks were clear, his orders to Alfred were clear and concise, orders for imprisonment of Thomas, what weapons he wanted, lock down the island and be ready to receive and lock up a Titan. Yes, Mab gave him some vague orders about carrying out the favors owed to Lara and the White Court, but from this point on Harry's listening to his own drummer as to what his plan is. That isn't to say he won't cooperate to a degree, one has to do that in battle, but in no way can he now be mistaken for Mab's pet.