User blog comment:- Darkchylde/Acnologia's Element?/@comment-173.87.12.242-20141211055642/@comment-173.87.12.242-20141214085310

i mean isnt it possible that the dragons on the human side saw the slayers as a threat to dragon kind so they decided to act isnt it possible that fairy tail was a threat to all humanity isnt it possible that he sensed zeref could be awakening so he took care of the threat also think about it he didnt make his decision(Zeref) until after the Grand Magic Games where he saw natsu was a live and getting stronger. As far as we know. Im not sure but didnt he arrive at tartaros to demand were END was when igneel attacked him?(went on Wiki)so not sure how accurate that is.