User blog comment:IamJakuhoRaikoben/Chapter 457: Naked Battle, Review./@comment-180.191.131.198-20151019171415/@comment-3290324-20151019171754

Marin's abilities stop all "spatial magic" including Requip, Celestial Spirit Magic, Teleportation, etc. When Lucy stomped on Marin, she was able to use her Celestial Spirit Magic again and she inadvertently allowed Erza to use her Requip again because Marin's abilities were making it impossible for her to do so.