The top is competing in a wilderness challenge and I think his brother pushes him off cliff or something. He is hurt (broke leg?) and thinks he will die. Crawls into a cave for water, drinks and passes out(?). Comes to and is healed but hungry and kills a big horn sheep with a thrown rock. Preserves its head in cave water. Goes to gas station. Is rescued. I have no idea of the author or story name. Used cat sort and had no luck.