Still not answering the question :p
Let's say I fight another player. How do we decide the victor?
Allow me to illuminate.
You've been playing my RP Tenshi, which has concrete rules and dice and stuff.... Whiiiiich is a pretty rare thing on this site. I've actually never seen another one have that. In some RPs the characters have stats, but they don't actually have any specific effect on the game, they don't decide who wins. I've played a number of heavy PvP on the site, and for the most part, well, you just sorta keep on posting what you do and sooner or later it becomes apparent who's winning, or someone gives in or something. Sooner or later someone posts about how they burrow a sword in the other guys chest and the fight is over. There's some implicit, gentlemanly rules that you can't just win a fight in the first post, you gotta do some posturing first, build up an advantage, but ultimately the one who wins is the one who describes himself winning.
That's basically the default system for all RPs on the site, and I'm assuming it's the same one Bel is going with. Even if not consciously, it's what's going to happen in practice.