Don't worry, there's no such thing as your creativity leaving you. I think you just don't know what happens next. Try looking up 'fight scenes' in Youtube or martial arts videos. They might help give you some ideas.
ya I have tried to work on a plot once my initial creative surge was over. ( wanted to get as much down as possible during the burst >.< ) and it has been slow going, I am currently stuck in the middle of a fight. but figuring out how i wan this chapter to end is a good idea thanks!