Charlie I think it depends on the location, the injury, all sorts of factors. In your case and in 99 out of a 100 cases (or more) going down and not continuing is the right move. But I can still also envision a situation where going up might also make sense. Especially around Mt Washington and the surrounding Presidential's where with the exception of the above treeline exposure, once you get out of the ravines the travel becomes marginally easier. From where he was turning around might mean 8+ miles back with a tough rocky descent but going forward it might only be 3-4 miles and possible help for his injury. Tough decision for a 17 year old, alone, with an injury. Never mind a 40 something.