Honestly, I thought the same thing! Why spend 5 days there before deciding to break your arm?
This guy knew no one was aware of his whereabouts in this untravelled region. He could have snapped his arm after a day or two - enough time to exhaust the other possibilities and overcome pointless hopes for rescue.
There was no need to sit there, risking his life even further by becoming weak and malnourished before amputation.
are you for real, you could just chop your arm off without being in a state of desperation???????
id try 4 days of trying to get my hand free before i decided to chop it off!