User blog comment:IamJakuhoRaikoben/Chapter 415: And It Shall Become Your Will To Live, Review./@comment-7418318-20150110184602

Now that I had time to think about it some, there is one thing that bothers me about this otherwise great chapter.

"We have so much to tell you, but instead of telling you we'll just disappear and let you figure it out by yourself, hopeing the lack of knowledge won't get you killed."... right.

In particular they should have told them why it's so important that E.N.D.'s book is neither opened nor destroyed before someone does something stupid with the book. With Zeref holding it the chances are rather low, but save than sorry, especially if sorry could well mean the end of the Human race as a whole.