User blog comment:BlackWizardZeref/Fairy Tail Chapter 394: Juvia vs Keith Review/@comment-77.194.131.32-20140725125535/@comment-7418318-20140725132742

That she exploded him from inside was a nice move, but I wish Mashima would tell us how that worked. Keither was able to completely turn his entire body into sand or dust. Why couldn't he just do the same then? Is getting wet blocking that power of his?

Likely, but I'd still prefer an official confirmation.