Arthur didn't expect a sudden blow up coming from Estelle. A calm, gentle, and naive girl whose only drawbacks was being a bit too slow and too romantic. To Arthur Estelle was someone who would easily be swayed upon the image of a familial love perhaps because it was something she didn't have before and now she was desperate to have. Knowing this, he didn't feel pity or a sense of responsibility to take care of Estelle, instead he used this weakness of her against her, knowing that if he pretend to be a loving and caring father, Estelle would have fallen for it.
But since when had that magical hold he had over her become gone?