User blog comment:Derax-Pagani/Chapter 502 Review/@comment-24784846-20160917221849/@comment-7418318-20160919180234

That's exactly my point. I don't see how Mavis could slip away before this moment without Irene noticing.

And if she really did somehow managed this miraculous act, creating the illusion of Zeref afterwards would have made zero sense for the reasons I posted before.