I'm surprised, a bit, how difficult writing fights can be. It's not at all like writing them for screen. "They fight." Great. Don't get hung up on details. That part isn't so different. <br>
What's helped most is having edited movies. I don't make a lot action scenes, but I've edited a few. Screen editing is all about establishing a space and then getting close. Prose writing is very much the same.
I'm always thinking about the small, important differences in art forms.