There's no suggestion his friend abandoned him. As I understood it, the friend didn't have the means to easily hike uphill or search, so he did laps in the area looking for him. If that understanding is correct (and it may not be, we don't know all the facts), you can criticize for lack of knowledge and lack of gear and poor decision making, but don't say that his friend abandoned him.
Truth is, we don't know all the facts.