It's possible the aircraft could have been somewhat tail-down & travelling backwards at time of impact - though fundamentally descending vertically..
Ok, not a flyboy (as y'all know) but that is the scenario that crossed my mind too and not a "Top Gun" style flat spin from 35k.
What could cause that to happen as I didn't think it was really possible unless under some really strange circumstances (have a theory but won't share it)? I mean, I thought you tended to go "nose down" in a stall (or soon after) so this "Flat Backwards" bit is bugging me. So is it *possible* or is it, as I posted earlier, a mistranslation?