The user firsts does a few footwork as the ball gets nearer. The user then punches out a couple of shockwaves as the surrounding area is in a slow-motion state and does an uppercut the moment the ball is in front of them. In the game, the user does a few footwork and simply uppercuts the ball as the surrounding area is in a slow-motion state.
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Flash Upper in the TCG.
Flash Upper in the English Original's anime localization.