User blog comment:Red Eyed Raven/just a quick thought/@comment-24066070-20131212091454

Jackal caused some long range explosions in that town (that circle of explosions all around the town), so he may be able to attack the MC from a distance. This would bypass their defense. Besides, these Rune Knights aren't that tough ether, Milliana has the magic power of a captain and her strength doesn't lie with raw power, so these guys won't be much of a defense anyway. About the dragons and demons joining forces, my money would be on the author simply not thinking it through. But in order to give it a plausible explanation, I'd say Zeref ordered Tartarus to step up after he "lost the last bit of hope he had", while if there are dragons doing all the killing, you don't need to send your demons out, since humanity will be gone either way anyway. Therefore, Zeref and Tartarus are just loitering around in F.Rogue's future.