User blog comment:IamJakuhoRaikoben/Chapter 468: Memory of the Stars, Review./@comment-5288632-20160110021038/@comment-7418318-20160110123402

It might just be a cheap device to stop Aquarius from giving the mysterious important information and Natsu just turns out to suffer from a severe case of magic depletion that'll go away in a few hours by itself or once he's eaten a good portion of fire... though I hope it's something more serious than that.