you don't understand, the damage the mystery does depends on the amount of chakra you have BEFORE using it. the chakra you get from his passive after doesnt matter at all, if we go with what your saying the mystery would remove 20% of the damage already done if your chakra is not high enough after the skill, doesnt make sense put that way right ?

why even ask for explanations on his mystery if your just going to answer back to everyone with how you think the mystery work. ScarletBlue already explained how it works.