User blog comment:Miskos3/Fairy Tail 511: The Hell of Starvation, Review/@comment-95.91.253.211-20161125202542/@comment-4829046-20161125214137

A HAX ability was used that was specifically designed to transport him to god knows where and it altered the laws of space. I think that gives plenty of reason, as bullshit as the whole thing was. The war would have ended too soon if Acno was just triggered to use a large scale DS attack. Not to mention it was against Zeref's wishes, so it probably messes with whatever Zeref and Acno agreed on at the start.