User blog comment:FairyRaven/Fairy Tail Chapter 399: Wings of Despair, Review and Commentary/@comment-24066070-20140908130106/@comment-9595671-20140908141728

I doubt Acnologia would help them, recall how Zeref said he sees them like bugs and doesn't even bother to speak to them?

I do agree he finds Face as a threat though, ultimately we don't know if despite they don't use Dragon Slayer Magic a dragon's power is a form of magic.