User blog comment:FairyRaven/Fairy Tail Chapter 453: A Father's Job, Review and Commentary/@comment-24277053-20150920140428/@comment-24277053-20150920160858

Maybe during his battle, he is losing he is about to give up, accept death, when Warren or someone with that power, tells Gajeel he is going to be a father, and that gives him the second win to turn around the fight and win.