Michael Dante DiMartino: Katara and Sokka were created hand in hand. We wanted a sibling rivalry as part of the story, probably due to the fact that we both have sisters. We were attracted to the idea of the sister having bending abilities, but not the brother.
I know some people don’t really like this ambiguous ending, but I think it’s great. This script has fantastic screen direction from Steve McQueen and Abi Morgan executed perfectly from Michael Fassbender. I love how nothing is spoken, but we can see all the emotions described just from Fassbender’s facial expressions. The final ending is changed quite a bit, but the same idea is still there. There has been some debate as to whether he succumbs to his urges or not, but to me that’s not what’s important in this scene. I think the message that this scene gives is that because he is an addict he has to go through a struggle with himself and his urges and his emotions every time he finds himself in a similar situation. This ending shows that for his character, it’s never really over (not at least until he gets some major help) and we can tell by that last look he gives that he is disgusted and ashamed by that, but at the same time, he still can’t look away.