User blog comment:IamJakuhoRaikoben/Chapter 482: Vigor, Review./@comment-4449950-20160419084318/@comment-2214433-20160419085145

I actually think that Erza shoo shoo'ing away the Historia made sense, much more than She's Erza at least. xD Neinhart said something along the lines of peaking into one's heart when summoning Historia and it's clear that in that moment, Erza's fear, worries and literally anything negative you can think of is gone, all there's left is courage and determination. So it's like the base for Historia is gone and that's why they disappeared.

But yes, if it was a little more developed, it'd be much better.