User blog comment:Miskos3/Fairy Tail 531: Pegasus vs. Black Dragon/@comment-5894890-20170414235951/@comment-7418318-20170416104104

While I agree on the first part (and I made the same point further down the comments already), Wendy was out of Acnologia's line of sight from the moment she boarded, so he wouldn't have any way to know whether she was alright or not.