"Reciting a spell is like singing a song in your head. You remember the words and how they fit together to form a tune, and the song makes sense. Same thing with spells. Remember the words and the magic behind them, which is always well-explained in any of the ancient texts I read, and the spell will flow forth. As for when you're out of power, you'll feel it. Like how you can feel the difference between something you could punch through and something that would just hurt your paw," he explains. "My question is, what are you going to do for me in return for all this knowledge?"