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The Thunder Knuckle is one of C. Viper's special attacks. Executed by performing a quarter-circle motion backwards and pressing punch, Viper suddenly moves forward, leading with her fist which is electrified by her glove. The direction in which she moves is determined by the strength of the punch button used: a medium punch sends her dashing straight forward while a light punch causes her to dash while crouching for a low attack, and a heavy punch sends her leaping diagonally forward, turning the move into an uppercut.