User blog comment:FairyRaven/Fairy Tail Chapter 391: Gray vs. Silver, Review and Commentary/@comment-33019320-20140704095638/@comment-7418318-20140704161136

Which was always quite iffy for my taste. Not so much that Chelia could hurt Wendy, but in light of Zancrow eating Natsu's fire I expected Chelia to do the same with Wendy's air magic.

Maybe Chelia just hasn't learned to eat someone else's magic yet or the book from which she learned her magic was damaged and that part wasn't legible.