User blog comment:IamJakuhoRaikoben/Sorcerer Magazine, Issue 41: May 2015/@comment-26418194-20150602121708/@comment-1776824-20150605200440

Gildarts using Disassembly Magic is out of the question, because you can't "guess" with unknown factors, you just have to assume that it can't happen. Gildarts using Crash is completely valid because Crash has been shown to negate magic, meaning that Gildarts could negate Minerva's Territory. Don't really need to get overly defensive; you can't assume that things you aren't sure will happen during these fights will happen, because that honestly means you are making stuff up. You have to go by what the series has shown, and the series has not shown anyone breaking out of Minerva's bubbles with brute force, or otherwise. It took a super-powered armor to do this. Minerva has shown to be able to manipulate the properties of whatever she chooses, including the air around her to teleport. It is extremely feasible that Minerva could just change the properties of Laxus' lightning and make it blow back in his face. Ergo, just another advantage Minerva has.