Quote Originally Posted by Buffalobiian View Post
Right-eye advantage didn't make any sense, but who cares. The party's starting!
Sure it made sense. Erza's right eye is abnormal and thus the petrification magic didn't work at all through it, only through her normal left eye. Based on the results, to fully petrify you need to make eye contact with a victim's two normal eyes. It's an obvious weakness of that petricular power, but magical powers oft have a weakness or two just like that.