User blog comment:IamJakuhoRaikoben/Chapter 458: Morning Star, Review./@comment-2214433-20151026065147/@comment-7418318-20151026082809

Considering that he looked away from Erza when Jupiter came flying in here, I'm pretty sure he was standing between Jupiter and her. Thus he would have taken the brunt of the attack and if Erza was hit at all, then only by the "splash damage". So I'm sure she took far less, if any, damage.