I've heard it many times from the writers of Star Trek novels:
"I don't like writing battle scenes".
Why?
Speaking for myself, I froze just before I wrote my first true slam-bang fist fight scene. I had to take a deep breath and do some "plexing" before I could continue.
From what I've heard, many writers (usually rookies) thoroughly enjoy doing super-tense build up, but when it comes to delivering on the promise of super-explosive fight conflict, they just can't bring themselves to do it.
I think it has something to do with how they think they should deliver. Someone posted here that they found fight scenes boring. This is sad, but true. Many fight scenes come across as dry and blah, and writers are afraid of that happening to them.
It's interesting... after I wrote the scene (and a few more later in the book), I was stunned at how much it gripped me --and I was the writer!
It may have had something to do with my style --I kinda write like Peter David, with a taut, lean style; complete with super short paragraphs.
That, and I try to write the scenes with a focus on the central character's mental reactions to the action.