User blog comment:B214/Talk About What You Want! 3/@comment-7401186-20141104112658/@comment-24468758-20141104183018

I actually ment this:

"People like Rias and Sairaorg-san who can easily take on multiple enemies alone is taking down the enemies quickly. Akeno-san uses her defensive magic and thunder+light attack to give strong support to the two of them." Vol 17, Life 4, Part 2

I partly remembered incorrect but the jist of it is that she is indeed much stronger than she appears most of the time.