User blog comment:FairyRaven/Fairy Tail Chapter 328: Zodiac, Review and Commentary/@comment-2214433-20130419132503/@comment-7418318-20130419132919

Unless the Hellfire comment was just the dragon showing off and trash-talking.

My guess would be that those particular flames aren't that different from Igneel's flames. I wonder could that Dragon maybe be the father or a more distant ancestor of Igneel?