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To do this, first obtain the L-rod and equip it. If L-rod turns into "X" sign, then you should not pass and turn around. If L-rod do not turns into "X" sign, then you can pass. Entering the wrong way will cause that the water flow will throw you to the starting position. More the distance between the point where you made wrong decision and the starting point, the damage of throwing will significantly increase, which will instantly kill you if the distance was far enough.