He does - perhaps he will learn differently in time.

I did not mean it on this occasion, little niece - I swear. I promised all of you I would not make such a wish again, and I swear to you no matter how dearly I have wished to, I have not spoken the words. That it happened again... I do not know if it might again. Will has no experience of this either - this has never been the case, so far as he knows.