User blog comment:IamJakuhoRaikoben/Chapter 376: Wendy vs. Ezel, Review./@comment-5426822-20140320210931/@comment-7418318-20140320223340

Considering how Face is powered by Ethernano and is charging up to critical mass, I don't think it's much of an ass-pull to have it surrounded by Ethernano.

Certainly a lot less than Erza being boosted by Azuma's spell or Erza conveniently tunneling through half a kilometer of Cube to arrive two seconds after Makarov said they'd need to find a way inside.