What was Marlon role in Wild

In the book Wild, Marlon is the author's (Cheryl Strayed) hiking companion for a short while when they meet on the trail. Marlon (also known as "Mac") is an experienced long-distance hiker who becomes a mentor to Cheryl and shares his knowledge and advice about the trail. They spend several days hiking together and discussing their lives, sharing stories, and offering support to each other. Marlon's presence and mentorship play an important role in Cheryl's journey, helping her gain confidence and experience on the trail.