"No, you don’t ..." Harry breathed hard. "You don’t understand ... you have no idea about the complexities of magic this advanced yet. Not a single clue. You’re still stuck in the arbitrary world of Hogwarts-level sorcery ... cast a spell, make something float. You don’t think about the bigger picture, the extended effects of magic like this ... but you go ahead and play with it anyway and to hell with the consequences."