Well, we're probably going to have to choose a place to battle first. I'm really going for any of the arenas, but since they're both Pyromancers it would probably be the fire arena. Or we could make it more interesting or choose one of the other elements, but I'm not really too picky, so you can choose.
Then after that, it's mostly a matter of who would win. I'm guessing it would be Scarlett because of her powerful magic, versus Sytano who's mediocre at best if we go with fire, but with any other fields he might have a chance- or not.