Imagine going to school, and this new kid gets brought in by the cops, and is funny, has poorly received banter with the teacher, argues with said teacher about historical accuracy during a pop quiz, floors a kid without laying a hand on him, consequently gets pulled into the rector's office with both his weird parents, they then throw a dance party which gets broken up because some little besom grassed, they leave never to be seen again. Then a few months later you find out that was the Avatar.