[Joshua is sort-of used to working with this particular demon (he remembers it from Orkili, and, naturally, he's going to feel some sort of affinity towards a fire bird proxy) so he allows it to do its thing while occasionally helping with this particularly stubborn leaf monster as Naoya explains the magic of his world.]

Although not completely analogous, we have a similar concept in my world.

Those who cannot use magic naturally can only do so with the use of a crystal. Much of our livelihoods depend on them.

[Which is a Problem, but that's neither here nor there.]