User blog comment:IamJakuhoRaikoben/Chapter 412: Dance Unto Ishgar, Review./@comment-4449950-20141209051619/@comment-1776824-20141209052202

Acno and Iggy were both covered in blood. The injuries Acnologia sustained are too severe to line up with the just prior detonation of Face. =/ Igneel did say that he could "go all out" when they were above the sky, and remember, he is apparently a real dragon king; the king of fire dragons, so I while he may not be out for the count, I'm counting this as he underestimated Igneel because the other dragons he killed were low tier.