User blog comment:B214/Chapter 504: Rift/@comment-7418318-20161001212543/@comment-27337151-20161001213857

That would explain it. But what was Dimaria doing during the whole scene while natsu was checking her out ;) ? Maybe Natsu only hit her with enough force for Dimaria to take some time to get back up. But then later, after the checking scene, hit her again after which dimaria's time stop broke.