Here is a video I made on the non-verbals displayed by MH in the short clip we have of him.
Now, I want to make it clear here I view non-verbals as very much secondary in detecting deception compared to statement analysis, but for general overviews of someone's disposition at a given time, they are invaluable.
I appreciate the sun is at an angle that probably would have affected his head angle, but that being said there are far too many instances of avoidance of direct eye contact.
What does this mean? Well, I don't see it as conducive to any nefarious reason.
MH is in numerous photographs and spent months in a tent really not that far from civilization in his latter days. That being said, he is most definitely avoiding being filmed face on here directly here, confirmed when he peers closer and then backs away towards the end.
It also gives a rare insight into his physique, which is interesting. We always see pictures of him as skinny and slender, but he had well-developed shoulders and upper arms which remind me very much of someone involved previously in swimming/triathlon or calisthenics.