User blog comment:Miskos3/Fairy Tail 530: Neo Eclipse, Review/@comment-5672982-20170409041910/@comment-30462872-20170409193105

Ikr. Acnologia, from my perspective, is one of, if not the smartest villain in Fairy Tail. I mean, he wiped out the dragons for goodness sake, surely at least one of them had a trick like the one Anna intends to pull, so he'll know at least somewhat how to evade it.

Let's take Rogue for instance. He definitely has the ability to pull a sneak attack or trap like this, an example being his ability to enter or become his own shadow. An enemy steps on his shadow form and BAM, he blindsides them with an RKO type knockout hit. Acnologia seems to have no doubts he can annihilate all the Dragon Slayers other than himself with ease, he might know their elements judging by how familiar he was with Igneel in their battle, via association with their dragons.