Review Detail of SalveYing in Avatar The Legend of Korra: Ruthless Wind

I always read the first 5 chapters to write a review. Now, my thoughts are that I see some flaws. For example, why is he an airbending master? Why does nobody care that he's an airbending master? Seriously, an airbending master appears and nobody wonders where he came from? All he does is say 'come, I'll train you' without any questions. Also, it seems like the story is following the script of the entire series step by step for now. Well, that could change; I only read the first 5. The main character is just a spectator; he doesn't change the events. Hmm, I don't know what good thing to say.