User blog comment:IamJakuhoRaikoben/Chapter 394: Juvia vs. Keith, Review./@comment-110.20.169.85-20140726011624/@comment-24800928-20140726015321

no its different. Aquarius was her spirit, so she technically always had that magic. Gray absorbed a whole new type of magic from another human which degrades all slayer magic and maybe all of lost magic since he had to put no effort in it. another example Cana pleaded (mind you she pleaded to a soul) for something to help her friends obtain fairy glitter, and even when she used it, she didnt have the skill to use it to its full potential. Gray's tattoo degrades this magic transfer because it was human to human and it wasnt just one spell.