One needs only to scratch the surface of human conflict to engage the scientific mind; so great are the depths and diversities found within it.
No later than the moment combative arts rose from the primordial ooze, its existence as an identifiable study immediately broke into a multitude of clear and distinctly different realms of science. A myriad of subsections and specializations that resided beneath the surface, unravelled with ever increasing rapidity.
At the mere mention of human combat, martial arts, self defense, or combatives, armed or unarmed, each and all demanded its own spotlight be focused upon their specific input, effect, and need as concealed within the magnitudes of science.
The question then is, "Which came first". Here the answer is no less opinionated than with the chicken and the egg. (By the way it was the egg...).