User blog comment:Otaku Chick/Otabear's Anime Review: Ep 143/@comment-1294565-20120813230444/@comment-75.47.155.62-20120818085214

Well in the manga, Mest learns that Wendy survives when he hears it from his friend while still in the rune knights. But since this filler arc is happening, he can't know of it until he comes back to the rune knights.