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This article, Shadow Shuriken Technique, contains content taken directly from our mother site. All credit of such content is reserved the original authors over at Narutopedia, the original article can be read here: "Shadow Shuriken Technique".
The user places two shuriken together and throws them both at a target simultaneously. When applying this to Fūma Shuriken, this attack can be more lethal. The goal is for targets to focus their attention on whichever of the two shuriken is on top, not noticing the second shuriken travelling below it. Ideally, targets will dodge the upper shuriken in such a way that they are left unable to dodge the second. If targets do at any point realise there's a second shuriken, the technique is rendered ineffective.