The photo in the original post is blurry to be sure, but isn't it clear enough that the creature's legs are a darker tone - which suggests that it is really just a man in trousers? Becaue the head is darker, I asume he's wearing a woolen ski mask. His gait and the length of his arms also suggest a man, not a yeti.
I cropped the image [actually provided from elsewhere and now destroyed] to just the figure alone and resized, sharpened, etc it. The lighter area at the bottom of its left leg might be a boot. The outer apparel seems unusually uniform / continuous over the whole body -- as if it is wearing very bulky coveralls or some other single-piece, protective garment. But this could easily be the result of insufficient pixel detail.
I do have to admit that the poor resolution could also lend the figure to being construed as either having a "furry" covering or some rough, homemade tribal material (possibly produced from animal hides). There's a pot-belly bulge to the abdomen, and what hopefully is only the illusion of a faint navel. The arms are skinnier in proportion to the rest, but they're obviously directed / lagging behind at angles. In the enlarged / enhanced image the head appears a touch pointed and thinner than it should be. Perhaps a turned hood might remedy that, though much of the body seems to be facing the camera close to dead-on (minus a minor twisting).
Since the photo was taken from a distance and there's no interesting activity / scenery connected to it, my opinion is that this is an image of an outsider (member of the Mansi?) who happened to be passing by. I mean, why waste film on a teammate who is so far away that he/she is unrecognizable, and doing nothing more significant than walking?
One might even suggest that this group was trying to set-up a fraudulent tale themselves to tell once back home, but the coincidence of devising it so closely prior to a real tragedy of their own seems a bit improbable (though certainly not impossible). For instance, despite only few survivors returning from a 20-man expedition [1917-1920],
François de Loys nevertheless found idle time to concoct a South American ape hoax by propping a dead, tailless spider monkey against a crate and passing it off as as a new species, portrayed as significantly larger in the photograph than what it was. OTOH, however, the gradual eradication of his oil-hunting party from disease and native attacks might also have been an added gimmick promulgated by the sensationalistic press of the era:
Brian Dunning:
"How likely is it that a geology party would allow seventeen men to die without simply making the short return trip to La Fría or some other town? How likely is it that de Loys would have continued prospecting if any men had actually been violently killed on the job? The job simply wasn't worth men's lives, and at no time was de Loys in so remote a position that he could not easily have returned to civilization. In short, his story, as printed, is almost certainly a gross exaggeration in the style of the popular adventure fiction of the day."
http://skeptoid.com/episodes/4302