What amazes me is the near-instantaneous speed of the shift. It suggests to me that something in the primitive part of a man's brain is wired to recognize and reinforce rank. Thus when a more superior man takes away another man's mate, often humiliating him in the process, a man confronts a decision: fight or submit.
The decision is not necessarily a conscious one. For both pragmatic and instinctive reasons, the pull toward submission can be powerful and consuming. Submission keeps the peace within a community, it avoids the danger of injury or humiliation for a man, and it helps clarify the social hierarchy among men. Perhaps a "submission instinct" is prorgrammed into men, in recognition of these benefits..
"According to Hegel, the relationship between self and otherness is the fundamental defining characteristic of human awareness and activity, being rooted as it is in the emotion of desire for objects as well as in the estrangement from those objects, which is part of the primordial human experience of the world. The otherness that consciousness experiences as a barrier to its goal is the external reality of the natural and social world, which prevents individual consciousness from becoming free and independent. However, that otherness cannot be abolished or destroyed, without destroying oneself, and so ideally there must be reconciliation between self and other such that consciousness can "universalize" itself through the other. In the relation of dominance and subservience between two consciousnesses, say lord and bondsman, the basic problem for consciousness is the overcoming of its otherness, or put positively, the achieving of integration with itself. The relation between lord and bondsman leads to a sort of provisional, incomplete resolution of the struggle for recognition between distinct consciousnesses."
https://www.iep.utm.edu/hegelsoc/#H4
"One of the roots of our misunderstanding of the psychology of the battlefield lies in the misapplication of the fight-or-flight model to the stresses of the battlefield. This model holds that in the face of danger a series of physiological and psychological processes prepare and support the endangered creature for either fighting or fleeing. The fight-or-flight dichotomy is the appropriate set of choices for any creature faced with danger other than that which comes from its own species. When we examine the responses of creatures confronted with aggression from their own species, the set of options expands to include posturing and submission. This application of ******* kingdom intraspecies response patterns (that is, fight, flee, posture, and submit) to human warfare is, to the best of my knowledge, entirely new.
The first decision point in an intraspecies conflict usually involves deciding between fleeing or posturing. A threatened baboon or rooster who elects to stand its ground does not respond to aggression from one of his own kind by leaping instantly to the enemy's throat. Instead, both creatures instinctively go through a series of posturing actions that, while intimidating, are almost always harmless. These actions are designed to convince an opponent, through both sight and sound, that the posturer is a dangerous and frightening adversary.
When the posturer has failed to dissuade an intraspecies opponent, the options then become fight, flight, or submission. When the fight option is utilized, it is almost never to the death. Konrad Lorenz pointed out that piranhas and rattlesnakes will bite anything. and everything, but among themselves piranhas fight with raps of their tails, and rattlesnakes wrestle. Somewhere during the course of such highly constrained and nonlethal fights, one of these intraspecies opponents will usually become daunted by the ferocity and prowess of its opponent, and its only options become submission or flight. Submission is a surprisingly common response, usually taking the form of fawning and exposing some vulnerable portion of the anatomy to the victor, in the instinctive knowledge that the opponent will not ******* or further harm one of its own kind once it has surrendered. The posturing, mock battle, and submission process is vital to the survival of the species. It prevents needless deaths and ensures that a young male will live through early confrontations when his opponents are bigger and better prepared. Having been outpostured by his opponent, he can then submit and live to mate, passing on his genes in later years."
Dave Grossman. On killing.
https://archive.org/stream/On_Killing/On_Killing_djvu.txt