Sound project, breakdown of the story

This is what I have in the way of a script or whatever: The Protagonist in this piece is passing through a forest or wood of some sort, casually as you do. As he gets deeper in the sounds become more vivid and he starts to speed up, talking to himself to calm himself in this strange atmosphere. The pace builds and strange distorted sounds keep cutting up the flow of the space causing more fear in the protagonist. The sounds build and build until they come to a loud and sharp end. There will be a prolongued ambient silence until the protagonist gasps for air.