Erza and Mirajane visit Crawford, the former Magic Council chairman, and fall into Tartaros's trap. And in exchange for information on Tartaros, Doranbolt frees all the members of Oracion Seis!
Then maybe someone made Erza 
and Mira fall asleep...
...إذًا ربّما قام أحدهم بتنويم إيرزا وميرا