The writing styles and techniques include short sentences to add punch and intensity to the situation. The descriptive language of when Joe injures his knee is designed to get the readers to cringe at the thought of that happening and what it may look like.
The purpose of interviewing Simon about his thoughts and emotions when Joe breaks his leg is because it’s the most climactic moment in the whole book, making it important to get both perspectives of the men. This means that Joe, the narrator speaks from an all-seeing first person point of view (omniscient)
If I were in Joe’s position, I don’t know if I would be able to do what Joe did or if I were able to, I don’t know how calmly I could operate. I don’t know if I would be able to shift my attention from the searing pain from my leg to my own survival. However, I may have a good chance as I’ve dealt with broken, sprained and hyperextended bones, but nothing to the extent of Joe’s experience.