User blog comment:IamJakuhoRaikoben/Chapter 476: Bid Farewell to the Mage Girls, Review./@comment-26389992-20160308030703/@comment-7418318-20160308231720

He stopped several people from doing it, but that doesn't mean he can stop everyone and it certainly doesn't mean he can stop everyone all at the same time.

I wouldn't be surprised at all if with him it was just something like in Natsu vs. Totomaru, where the Space Magic user just has to figure out how Marin blocks them and then they can go around that... or in Erza's case just overpower his ability to block with her massive magic power.

Remember that the first time he surprised Erza and the second time she didn't even know she was being blocked by him... and he was quickly taken out by Lucy and Cana so she didn't have time to figure it out, plus she had her hands full with Ajeel.