The trajectory of the Mysterious Uncertainty Cloud Sword is determined neither by the Caster nor by the subject of the spell. Once observed, it will collapse into a state that has already struck the Observer, reversing cause and effect, dictating life and death, with infinite uses beyond comprehension.
So, when you unleash the Mysterious Uncertainty Cloud Sword, it doesn't matter if you can see your target or know the direction of your attack. As long as you're sure the other person is watching you, and your Sword Qi has a chance to cover the area of your target, you can slay an immortal with one stroke.
Chen Youjia must be paying attention to Wang Qi right at this moment. Once this sword is drawn, the Sword Light will automatically pursue the target, and Wang Qi will also know where Chen Youjia is. No Law can reverse the "cause and effect" of the Mysterious Uncertainty Cloud Sword.
