Izanami works by having a sharingan record a series of movements and then casting the genjutsu to put the victim in a loop. Kabuto was trapped in the loop of him stabbing Itachi's crow clone, but the actual release of the jutsu happened here.
Putting his fingers to his face was him casting the genjutsu. The same thing happened when he put Naruto in the finger genjutsu. Itachi had already wove the signs for a jutsu, with his fingers he released it.
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Putting his fingers to his face was him casting the genjutsu. The same thing happened when he put Naruto in the finger genjutsu. Itachi had already wove the signs for a jutsu, with his fingers he released it.
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