User blog comment:Miskos3/Fairy Tail 541: The Magic of Hope, Review/@comment-7418318-20170626140321/@comment-7418318-20170626172633

That's the point, we don't know what it was like within the Ravines before Acno absorbed them. If they allowed someone to move a few minutes before erasing them, then Acnologia had enough time to eat them.

But with Fairy Sphere we know that the FT members weren't even aware that ANY time has passed between the activation and disspelling of the Sphere. For them it was a flash of light and suddenly it was seven years later.

If the same applies to Acnologia he wouldn't have any time to eat it. If everything works as planned, he'd only realize that a spell was cast on him when he already comes out of it however long in the future... IF it works as supposed.

Usually I'd assume that it won't work, but with just a few chapters left, I think it will, because there's too little time for anything elaborate.