It's an interesting presumption on the part of the forum members that this chap didn't do a risk assessment.

I beg to differ. In fact think that it went something like this:

Map? Don't need. I'm on a trail.

Matches? Same answer.

Bug repellent? Don't need. I'm on a trail and at altitude.

Footwear? Adequate for the trail.

Head torch? Not needed, long days and expect to be back in good time.

Now it had to be said that had he stuck to the trail that assesment would have been completly correct. What he failed to appreciate is that when he chose to leave the trail the risks changed.