Okay, this is still me trying to rationalize what happened.. it's the next freaking day and I`m still in shock and trembling. What really hurts most is that he betrayed Iroh.. Throught the whole series, except for the VERY beginning, Zuko andang have been portrayed as rivals/equals in battle. The driving force in the plot for the 2nd season was Zuko's desicison making. Aang's traing/quest seemed to be background for this instead of the forefront like in S1. For Zuko to trly complete his charachter, he has to eventually defeat Azula. We know all too well how stubborn and impulsive he really is now, and he may end up beating azula at her own game(I can easily see him winning over first Mai, then Ty lee), and becoming Firelord, if only for a brief moment. Zuko and Azula may end up joining to ovethrow Ozai, then zuko would do exactly what azula did to long feng here, and defeat a weakened azula with help from his new allies. The finale could be a huge, sorroful battle between Aang and Zuko, friends/allies that could have been. IMO, we all thought he was being groomed for being a new hero, but with all this attention, and ultiamtely choosing the dark side, I think he may be the final enemy.