User blog comment:IamJakuhoRaikoben/Chapter 477: Transport, Review./@comment-26271908-20160314174631/@comment-5303512-20160314203549

Also either Erza somehow managed to dodge the beam at the lasts second or didn't take the full brunt of the laser. And either way the out come would still be the same.

Also the anime can enlighten the whole thing.