User blog comment:IamJakuhoRaikoben/Chapter 394: Juvia vs. Keith, Review./@comment-4449950-20140725115357/@comment-76.161.172.226-20140725160046

People really need to remember that Fukuro was absorbing Natsu's magic right after swallowing him, and Blue Note planned on taking Fairy Glitter from Cana's corpse. Not to mention Natsu and Gajeel eating lightning and shadow DS magic respectively, or Mavis granting a use of Fairy Glitter to Cana. People gaining magic by absorbing it, or being granted it is already established in this series.