So it just occurred to me that if Yuri K. indeed bit his skin off the back of his hand (because the skin was found in his teeth - how we can say it was his skin and no one else's, I am not sure).
Unfortunately I don't think we will ever know - if it was someone else's it would better prove a brutal fight.
But anyway, the fact that this is what is assumed to have happened perhaps points to the notion that he was trying to keep quiet.
Why??? This could be because he was hiding from either other humans, other hikers or animals, right? Otherwise, why try to stay quiet by biting your own skin off Ie. stifling a cry - as the coroner put it.