User blog comment:DarkLordZeta/Is it just me or has Fairy Tail/@comment-3075024-20140409194155/@comment-7418318-20140410172832

Or looking back, she might have needed that minute to stop Minerva from interfering in her battle against Erza.

I'm pretty sure Minerva is far too eager to attack Erza to just stand there and watch her battle against Kyouka, unless there was something stopping her from attacking. Something like orders from Kyouka for example.