User blog comment:IamJakuhoRaikoben/Chapter 291: Naval Battle, Review./@comment-4653886-20120713135625/@comment-3290324-20120713145413

Don't be ridiculous. Every spell requires activation. Juvia didn't see the activation because she was too busy looking at Gray. Could she have defeated Minerva? Of course not. But the "Gray-sama" thing has gotten tired and her entire character is now completely centered around him.