User blog comment:IamJakuhoRaikoben/Chapter 330: Zirconis' Magic, Review./@comment-5268982-20130512160036/@comment-2214433-20130512163520

I dunno why you keep comparing her to Robaul as there's no proof they're the same. And there's no actual proof about his tangibility/intangibility either.

Again, I'm sure Mavis can control that. This is not the issue here, and if it was, I'm sure Mashima would make one of the characters ask/mention it.