First Korobug, this is a forum for discussion and advice. We cannot become a better writer if we aren't open to criticism. Your opinion is welcome as long as you are willing to allow others to have their opines as well. We have no specific person answering anything unless the question is directed towards him or her alone.
Safisan-My question is: should I add back-story to the battle? Not in the sense X and Y have reasons to fight, but things like flashbacks and memories which, while not directly involved in the fight, do explain certain things like powers or moves.
Safisan, I think back story added into the battle is fine as long as it doesn't detract from or dispel the illusion of the fiction you are sharing. Back-story can be incorporated via internal dialogue, memories, or triggered by events currently being addressed. The showing of the back-story will be the challenge, in this type of writing, especially textual combat, we must show and not tell.
Writing combat effectively is difficult because if we write it technically it will be boring, even to someone who understands the moves. Imagine a causal reader trying to decipher the intricacies of moves if you merely tell them via a purely mechanical style. However if you show the moves as a fluid and active component of the combat scene, it becomes more engaging and easier to incorporate the back-story in a way the casual reader gains an insight to the character as well as see the move in action.
Victim130, I notice you have a family, Brendan, Sophia and Clare and having scanned the character sheets for each of them the history of the family seems very thin. I think if you take each of them and spend 15-20 minutes just free writing about each of them, you will be able to craft a more engaging familial history and show truer emotions when you write about them. This is of course regarding the duels you have where two family members have to fight together.
Jace, verbose and wordiness doesn't necessarily create compelling fiction, which is one reason I detest purple prose in duels. To many wasted elaborate words on really non-essential aspects of the fight that someone thought showed literacy. I much prefer dense words that have impact than excessive wordiness.
Anyway those are my opinions.
Skall