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From Tekkenpedia

Counter Attack, also known simply as Counter, is the term that describes the effect of attacking an opponent while they try to attack you. You can also use Supercharger to give a hit the properties of a Counter Attack, however, damage is calculated differently and will take precedence over an actual Counter Attack. Counter Attacks will do more damage and sometimes have different effects. An example of the former is Armor King's "Low Drop Kick", which will do 28 (116%) damage on a Counter Attack (it will usually just cause 24 (100%) damage.). An example of the latter is King's "Konvict Kick". If it is a Counter Attack, King will perform a "DDT" after the kick. Other effects can includes stuns, knocking the opponent to the ground, or making an opponent airborn (suitable for juggling).