[jessaustin]

Getting knocked out in an athletic competition is one thing. Getting knocked out when a neighboring tribe is attempting to kill all your men and old folks, enslave everyone else, and steal everything of value, would probably have been something else.

[sheensleeves]

If you're unconscious, you're not a threat any more.

Live to fight another day.

[jessaustin]

Inter-tribal resource wars might be fought by primitives, but they're not fought by idiots. Nor are they fought by chivalrous knights. The throats of unconscious warriors will be cut. Even if a throat was missed in all the chaos, what is the evolutionary advantage to a male of living on after all fertile females have been abducted?