It is not true that an assassin would have to be in the same position for a long time. When competing in sports, you must follow certain rules. Without rules, you can immobilize another person in a few minutes by kneeling on them and burying their head in the ground. There may also be more of you. Dyatlov had ice on his face and under his chin. Before he died, he breathed into the snow for a long time, melting it with his breath. Many also had visible nose injuries.
Of course , humans, assassin's or whatever you want could attack the hikers . But there is little to show for it apart from our lack of knowledge as to what happens to humans in the conditions they were found.
We must rule out nature first . As has been said time and time again, there was hard ice on the slope under the soft snow, several searchers injured themselves on the slope and one had to be taken away to the hospital.
Bruised knuckles and damage to parts of the hands are part of process of survival and a cold environment. It's the same with the faces, the nose is the extremity, as are the cheeks of the face . Hand control would go and if walking/crawling on all fours , I suspect the hand would become used in fist form rather than palm .
It is the opposite that is true , if there were no marks and signs of frostbite , no red noses or abrasions, no fire , no burnt hands or legs next to a fire etc, it would be then we could rule in outsider's.
We would expect to see mild trauma on the unprotected skin surface for those exposed to the weather conditions. I don't think there would be a fist brawl on a mountain slope , if there was , it would most likely be between two hikers and not outsiders.
When you are fighting for your life , you don't follow the rules of a punch to the nose and chuck one back , I would expect to see nails ripped off, broken fingers and possibly arms. I would expect to see ripped clothing and blood .
Please Google frozen bodies, look for evidence based practice research papers and autopsy findings .
Unless the whole Dyatlov case is a hoax everything fits , contradictions as well.
1)The UPi just thought the hikers were late , they were neglectful.
2)The Kremlin got involved because family members were requesting help because the UPi were being slow. ( Every country does this for loved ones)
3)The search was done in a correct fashion to find them as soon as possible.
4) the tent was found on the route ,
5)footprints of 8-9 were found going away from the tent down to the treeline .
6) a fire was made and branches from that ceder tree were also used as insulation from the snow .
7) clothes were cut and repurposed for survival.( This does not imply outsiders )
8) there were attempts at making flooring in a ravine , these are the broken firs and ( I think) one birch tree at the den.
9) in recent reports and one at the time , it is said that these small trees are easy to snap with the hand .( The ones used for flooring at the den).
Bruised knuckles would probably occur during the above.