Water Theory can be broken down into several different aspects.
The first is the ability to flow around obstacles, like a stream around a rock; this is reflected in the Hapkidoist moving around an attack. Water dripping onto a rock can find weak points and through constant pressure flow into and through the rock, this shows how a Hapkidoist can attack an opponent and through a weak point enter the opponent’s defence to take control, or to damage.
Like the power of a wave crashing onto a beach, so too can a Hapkidoist focus their attack. This is also shown through the power of water when pushed through a pressure hose, this concentration can be focused into doing more damage to your opponent.