User blog comment:FairyRaven/Fairy Tail Chapter 365: Fairy in the Jail!, Review and Commentary/@comment-24257713-20131229050248/@comment-1359322-20131229111018

Who knows maybe Kyouka was planning to toss Erza into the same place as Mira after she finish interrogating her, so rather than stripping her after interrogation, it'll be more effective to just interrogate her and toss her into the same device to modify her.