Once you've established what the problem is, what the challenge is what action takes place, you're telling a story. You got to tell people about either what you did or what someone did what the other character did in your story. Don't make them guess. Don't make them wander. Describe in great detail what specific action takes place. action movies are often the best selling movies around the world.
Now you're not trying to be a movie maker here. But you can borrow the movie makers elements for success and that is to really describe in detail the action that takes place between your characters.