Also, if he wasn't right eye dominant before, he was after his father burned and half blinded his left eye. I'm ambidextrous, and have no discernible dominance with either eye, which I used to good effect fighting. People would think I had one dominant hand, until all of a sudden I switched it around on them. Also nice when learning Semitic languages. They're so much easier to write left handed.

Teo: *tickles*
Zuko: Stop doing that!
Teo: *smirk*