Owl to Ryuuji, but seriously, is "Prince Formerly Known as"...supposed to mean something?
Duels can go to the death, but that is rare. The slight would have had to be significant if that were the case. Combat usually ends when one opponent isn't moving. There are also a variety of duels, but the most common one is the Agni Kai. It is very straightforward, really. I've been in two of those.
As for those who have defeated dragons with fire, that would include all of my ancestors. I know Sozai up to my father have done it. I'm glad no one will ask the same of me Outside of my line, there are a few powerful warriors whose tales claimed they have, but who really knows? I've never seen it with my own eyes.
Seven types? It will appear that I will be in luck.