User blog comment:Miskos3/Fairy Tail 531: Pegasus vs. Black Dragon/@comment-5894890-20170414235951/@comment-30462872-20170418123301

NoNickNeeded, Dragons and by extension Dragon Slayers have enhanced senses, hearing, smell, sight, even sensory abilities like feeling magical signatures. I'm pretty sure it's within Acnologia's capabilities to hear Wendy not being sick or complaining about the vehicle. Heck, I would not be surprised if an arrow flying at his face appears to be in slow motion to him, his senses being that good.