User blog comment:Omega natsu2/Episode 186: The Future Accelerating Towards Despair, Review./@comment-24277053-20140614221031/@comment-7418318-20140615073330

Just look at her reaction when Jellal was unmasked. She was reacting so strongly that it was making her physically sick and she just barely managed to keep it together. But there she was collected and calm when she laid eyes on him.

In the GMG event on the other hand she was in full combat mode already, with adrenalin and all that running through her system, then saw Millianna suffer helplessly at Minerva's hands, eroding her self-control a bit and then finally Erza said that she was the one who killed Simon.

Even a monk would have had problems to keep his cool in such a situation.