At the beginning of chapter 34, Jack demands that his father make him a mask and is amazed when his father refuses. Why did Father refuse?

My copy of the novel only has eighteen chapters.

From the text:

`For two reasons: firstly, because I do not consider that I must do anything that you demand; and, secondly, because I think that you are very capable of doing it yourself. However, I must congratulate you upon your abundant supply of game; you must have indeed worked hard.