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The Eight Trigrams Sixteen Palms is a manoeuvre of the Gentle Fist fighting style. It is essentially a halved version of the already halved Eight Trigrams Thirty-Two Palms. This technique is used to close off the flow of chakra through sixteen chakra points of an opponent's chakra pathway system. This eliminates their ability to use chakra for quite some time and renders them unconscious. It also appears to cause internal damage, as Mukai's target was spitting up blood.
Once someone is within range of his field of divination, Mukai assumes his Gentle Fist stance and begins to deliver his attack:
First, two consecutive strikes to make two.
Second, another two consecutive strikes to make four.
Third, four consecutive strikes to make eight.
Fourth, eight consecutive strikes makes a total of sixteen.