User blog comment:Relikz/Chapter 364: Tartarus Arc, Part 1: Immorality and Sinners, Review./@comment-3290324-20131220064649/@comment-1359322-20131220111128

Yeah i know, mine is just a theory as well after all. Tartaros was expecting that FT will definitely visit Crawford, so they gave him a special undetectable curse to put on the tea that puts a mage to sleep after using magic, thus Erza and Mira feel asleep after fighting the cannon fodders. They might have sent those cannon fodders in preparation of that too.