My bet is that he did most of his walking, if not all the first day. I have trouble seeing him survive the first night, soaking wet and 35deg. I do not think you could spend a night (a long night at that) in those conditions and survive. You call it a ravine, that is what I call a canyon, and a "bottomless canyon:" at that. I guess to appreciate the term "bottomless canyon" you have had to stand at the top of one looking down.