Mangekyō Shark Sword

This is a combo move by Itachi and Kisame. First, Itachi uses his Mangekyo Sharingan on the opponent to trap them inside the Tsukiyomi, then comes walking up behind the opponent and stab the foe in the back, leaving them open for an attack, Then Kisame comes up from the water below to finish the foe with a slash from his Samehada.