I actually found this chapter... Detailing (if that makes any sense)
This chapter, useless at first sight actually has a few meanings behind it. Irene is Erza's mother yet before this chapter she was no different from other enemies Erza had fought against; all just threaten her guild. Now what Irene did to Wendy made it more personal for Erza, thus the text at the last page of the chapter "pitch black hatred" was put, Irene hurt Erza's friend and Erza took away (I guess...) Irene's dream body. So in conclusion: the next fight will be all out, no mother daughter feelins, just pure hatred for each other. Also this chapter can also conclude ever the strongest female of the 12 spriggaids acknowledges Wendy's potential, and that, surprise surprise Irene didn't use Wendy's dragon Force, yet look at the destuction she did, and that maybe Wendy may or may not have gainted body switching magic. (Though I'll honest; this was not worth 3 weeks of waiting!)