It comes down to the type of work you are writing and the style and approach you want to take with respect to fight scenes. There isn't one right way to write a fight scene. If you want a cinematic action sequence that gives a close to blow-by-blow account of the fight and tries to pull the reader headlong into the action, go with short, punch sentences, active writing, and use strong words that will impact the reader. You certainly don't have to write a fight scene that way, however. If your entire work follows more of a wordy, flowing style, there is not reason you can't maintain it during the fight sequences. In some cases, you certainly may want to do so to maintain consistency in the work. You might still take the approach of a more blow-by-blow description, or you might describe the fight in summary form. The latter has been done very effectively by authors. In either case, you might use long, slow sentences in writing the fight. There's nothing wrong with that. Figure out which approach works best for your story and your vision and go with it.
