As has been stated so well earlier with most hunters or hikers it is pure panic. But I volunteer with a SAR team and the vast majority of the missing people we look for are either suicides, or drug related. An awful lot of suicide's don't want to be found and can make it near impossible to find remains. Some go as far as digging a shallow grave and covering themselves up as much as possible. Another left behind clues that he had ran away with someone he met on the internet.
Others have hallucinations when high on drugs and believe they are being chased. Some drugs make them feel as if their clothes are on fire. And they feel no pain. They keep running though briars naked that no normal person would go through until their hearts just give out.
