“And they always seem to have massive scalp injuries if not actual teeth holes in the skull, which makes me think that is an attacking technique by bears.”
If your skull is small enough the the bear can fit your head in its mouth it will crush your skull and pick you up by the head and shake you until your neck snaps. Crude but effective. Of course if you spray it with some pepper it will not do this... /s
Bear Spray = Condiment.