[He listens very carefully and makes a thoughtful look when the other finishes.]

That's because magic doesn't work like that. First of all it's not something everyone can use. It depends... [He hesitates a moment.] ...Well, some people are just born with this power, but it doesn't mean all of them can use it right away either. It takes practice but magic really allows you to do all kind of things, not only use fire just like I did, but also use wind, lighting, water, freeze something and even heal.

[He smiles. He's a nerd too.]

Sorry that I can't explain it better than this.