Explaining everyday life in numbers and mathematical logics , either produce super simple concepts to grasp or very abstract ideas to understand...nothing in the middle..
My view on this would be ; and ideal aikido's response to an attack should have an inverse proportional relation to that attack , so a combination of both is zero.
Newton's Law of Action and Reaction if i remember right... I pity the guy who comes at me with less than a 4 then

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