User blog comment:Derax-Pagani/Chapter 507: Voice/@comment-198.21.192.112-20161028222729/@comment-7418318-20161029120357

What good would that do?

Not even Makarov, who was well experienced with Fairy Law, couldn't hurt the Shields. I seriously doubt a beginner could do any better or that many people casting it at once will have an accumulated effect.