Answer:
I believe that all of the above would be the correct answer. Let's say the two fighters were called A and B. Let's say A was the one who won the fistfight/argument/whatever they were unhappy about. A could say that they were the victim, and fought defensively. So could B. A could say that B started the battle, and B might be a sore loser, and deny the fact that they lost. If this is wrong, then I'd say the two sides could describe the way they fought differently, or the two sides may disagree about what or who started the battle could be the answer instead. Hope this helps! :)