"You're still making assumptions." Sharp, pointed. To presume that he was effectively the same man as the other world's Ibiki, simply because he had welcomed Itachi and was giving him some level of instruction, was potentially dangerous. Who knew -- even Ibiki himself did not, after all -- where the little variances might be?

This Itachi was not the same as his own; his own Itachi had suffered health problems, yes, but defects of the heart were not among them. And of course, had Itachi not mentioned it, Ibiki would not have known from this brief meeting that the defect existed. The same logic worked in reverse. A minor difference could not be predicted until evidence arose for its existence. And the minor differences could very well be dangerous, even deadly.

"Why do you think people are afraid of me?" he asked, clasping his hands behind his back. If he was going to instruct Itachi, then he would do it thoroughly.