User blog comment:IamJakuhoRaikoben/Chapter 471: Until the Battle is Done, Review./@comment-4933386-20160202013609/@comment-7418318-20160202092017

Maybe Acno was really far away and by the time he was close enough, Natsu was already down for the count, so he switched over to God Serena instead.

Or maybe Serena was geographically between Natsu and Acnologia's position, so Acno just made a quick stop to smash Serena and is currently heading for Natsu or one of the other DS.

"Is Dimaria the reincarnation of Zirconis? They both seem to have a fetish of stripping women's clothes."
 * Zirconis had no fetish. He stripped people because he didn't want to eat the clothes. And he stripped his "food" regardless of gender or age.

"Well I guess Erza and her fighting would make sense as people predicted, one that strips clothes, one that can requip clothes/armor in a blink of an eye."
 * And what's more we've seen plenty of times that Erza isn't bothered by being seen naked even by strangers. Everytime she re-quips she's stark naked for a second or two.