For me too
Short of a head injury which can cause a sudden escalation in temperature, this makes no sense.
First he dropped his ballcap and backpack, then his clothes, in stages, presumably while walking or running along the road. Then he laid his wristwatch out with the straps flat and stretched on either direction, not quite the likely placement had he just dropped it. More like one would leave thins had one being planning on a midnight swim.
I never subscribed to a possible drug induced or organic psychosis/delusion/ hallucination or any of it.
He spoke with a friend, packed his vehicle for his trip home and set off..
that is all.