User blog comment:Miskos3/Fairy Tail Chapters 532 & 533, Review/@comment-7070784-20170422053208/@comment-5303512-20170424121616

No, the person said that the magic activates when Coby opens the book, but yet it activated despite not being opened by Coby.

No, not rearrange or whatever, but deciphered it, she knew what it was after she read it and before the spell was broken.