User blog comment:Miskos3/Fairy Tail Chapter 404: 00:00, Review/@comment-7418318-20141011093404/@comment-5303512-20141011145116

Maybe because Minerva wasn't Erza and she couldn't deal with the Pain she was inflicted with.

And she had faith in Erza and when she saw Erza falling down she knew she had to do something even though in the end it was futal.