Snow bridges and cornices are well know hazards in mountaineering.
As far as I am aware most victims of collapsing snowbridges fall underbody down in the gap.
When gaining speed to around 10 m/s or a little over 30 km/u, this kind of falls result often in broken bones.
The first main issue with group members falling through collapsing snowbridges and cornices is: the post mortem report lack mentioning:
- broken toes, ankles, knees, legs or sprained ankles, knees
- broken hips, or damaged spines
- broken fingers, hands, wrists, elbows, arms or collar bones or sprained fingers, wrist etc.
The second main issue is:
- the broken ribcage of Semyon as seen on the photo in the mortuary may well have been caused by an impact after a severe fall, but:
- the fatal broken ribcage of Lyudmila as seen on the photo in the mortuary doesn't show any indent or deformation that may indicate an impact after a severe fall.
First remark: The description of the broken ribcage of Lyudmila indicate that she had suffered fatal internal bleedings, probably caused by broken bones damaging blood vessels in her chest.
Second remark: I am not aware of any fatal impact - after a fall - that results in a fatal broken ribcage ànd the fatally damaged ribcage returning afterwards in its normal shape.
Third remark: I am only aware of a hypersonic pressure wave - several bar overpressure during a few milliseconds - followed by an underpressure during a second or so, that may result in the fatal injury of Lyudmila.