"Would have been hominids, probably Neanderthal, not humans. "
Isn't that a little early for Neanderthal?
300,000 BC is usually the earliest date shown on timelines for them.
(On the other hand, 400,000 BC...probably some use of fire in limited areas.)
>>The skeleton was also found with a number of flint tools surrounding it, indicating that it was probably slaughtered by humans.
Ok, how about this: the skeleton is 400k years old, but early people found it dead later. Like those mammoths that cropped up in Siberia, fresh enough to eat. Maybe there was a warm spell 100k years ago and humans spotted these big critters in the ice, then dug into the "freezer" for easy, pre-killed, fast food.