Problem is there are lots of possible explanations and its virtually impossible to say given the lack of evidence which explanation is the strongest.
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Yes, there are lots of possible explanations, but there is only one true explanation. There are also separate elements to the mystery, and for each element you pin down, you eliminate many of the possible explanations, or at least demonstrate that they are extremely unlikely.
Example - Lyuda's injuries. Single large and very fast impact, with no obvious secondary large impacts. She fell and hit the ground front on. Crushed ribs, crushed nose, massive bruise on front of femur and strange movement of hyoid bone.
If it was a shock wave and she was standing up then it could have easily thrown her up to 50 metres horizontally in which case you would expect additional significant injuries. Same for Semyon and Thibo.