User blog comment:Armagon1000/Gunvolt vs. Laxus Dreyar REMATCH!/@comment-29716726-20161102033127/@comment-26826501-20161102104416

Fairy Law would take up too much Magic to be used twice in a row. The only way he would be able to do this is if he was able to eat Gunvolt's lightning to recover Magic or if he had Fairy Heart, which is an infinite source of Magic. Seeing as how the former would only work with the Flashfield and the latter isn't avalible, Laxus has no way of using Fairy Law twice in a row.