User blog comment:IamJakuhoRaikoben/Chapter 412: Dance Unto Ishgar, Review./@comment-4449950-20141209051619/@comment-4489126-20141209053900

I think that the panels Misk was linking showed how he can make the tattoo appear when he wants to use the Magic, thus the "shuuu" :3

Also, I didn't notice Lucy's undies. LOL, good find.