Alpha Male v Predatory Threat Low Tech Combat
This is a very important distinction because you prepare differently for social aggression and predatory aggression. For social aggression you emphasize defusing and de-escalation and then constraining and defending. For predatory aggression you emphasize avoiding, then defending and constraining.
A good technical article on this distinction:
Also see Grossman's book, "On Killing," which makes the argument that most violence is not of the predatory type, that preying on human beings is "unnatural" for our species, and that special training or indoctrination makes it possible.
Link to "On Killing" at Amazon: