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It's just a move that deals fixed damage and stuns the opponent (provided the opponent is within Counter's range).

Press Counter -> Animation (Like squatting on a toilet bowl lol) -> Opponent hits -> Counter activates, hitting for fixed damage and stunning the opponent

Erm, clear enough, I hope? Oh yeah, as mentioned somewhere else before, be careful not to get knocked back as you press Counter, or you might get stuck in the animation (which a certain Fishie did to me >.>), and would have to relog.

EDIT: I just realised I wasn't being clear enough. =.= Anyway, I meant that regardless of the damage of the move being Countered, the damage you deal with Counter is the same.