I hadn't thought of the possibility that they might have been sunk by liquefaction as you suggest. But then I thought some more and realized there might have been a difference between a body sunk in the lake with rocks on it and a living animal standing on a surface. For one thing the body wouldn't have weighed that much more than the water it was sunk in, that was why they had the rocks. And the area in contact with the lake bottom would have been quite a bit larger for a body lying down and a living animal standing up. After all, the prescribed remedy if you are caught in quicksand is to lie down, that spreads your weight over a larger surface and keeps you from sinking more.
So there isn't a quick answer. We will just have to wait for more information. I still somewhat doubt that it was killed by humans 40,000 years ago.
Bill Gill
