One thing that caught my eye was "both were coated in human or animal fat" and "throwing stick smeared in human or kangaroo fat". I mean the "human fat" part,

One thing that caught my eye was "both were coated in human or animal fat" and "throwing stick smeared in human or kangaroo fat". I mean the "human fat" part, that seemed strange. Getting human fat non-lethally is probably impossible using technology from 12000 years ago. If the fat was obtained from a human corpse, it would rule out at least burying the body. But still, wouldn't obtaining the fat from a non-buried corpse disturb the deceased on some religious-spiritual level? Or was it common to mutilate dead enemies or something like that? Edit: Oh, OK, I saw others asking the same question and replies which shed light on this.