Originally Posted by SS2 Vegeto

If you look him in the eyes, while he activates mangekyo sharingan, you are trapped in an illusion, a mental dimension that Itachi controls as God, where space, time, and all things are controlled by his will, and it takes affect instantly in real time, while days might pass in the world of Tsukoyomi, completely at his mercy, subject to any kind of torture that he might desire, and at any time, if he so pleases, he can kill you, and there is nothing you can do about it. You will die.