[Cassius stares at his hands for a short moment.]

I require more training.

[It is as simple as that. And just like Eustace he has many questions as well. Because he might have been stuffing his face with cookies, it still made no sense that these cookies were growing on trees.

So...

Why is it that these biscuits grow on trees? They do not qualify as fruits or other plant based nutritions. Hmm. [...no he isn't answering your question immediately, Eustace. There are cookies hanging from a tree.] Do these trees grow in the Sky Realm as well?