User blog comment:FairyRaven/Fairy Tail Chapter 372: Breach, Review and Commentary/@comment-24367018-20140221123736/@comment-7418318-20140221135929

Or maybe chapters.

With the action being split to three or four places (Undercube, Natsu, Mirajane and maybe Lisanna, if she's intercepted on her way from Natsu to Mira) it's possible that this particular mystery might skip a chapter or two until it's adressed.