the text of Poodlebell is very interesting and seem to explain the reality; the fight and flight of animals, human, natural humans;
but for me, it does not explain what happen in our body because we are not in that original system with terror,
we are nerves destroyed/poisoned by toxic substances in random, there is no fight and flight in front of a danger, there is adrenalin which flows and flows without reason, cannot stop, or other things who do not function although the order comes and comes; as Healy said, it is more complicate than we can think