User blog comment:Uraharattack/Chapter 464: 400 Years (It's out guys)/@comment-26537859-20151130154544/@comment-153.91.160.215-20151202064558

He is not fighting with the full magic power of igneel he is only fighting with a portion of igneels strength. Igneel only had a portion of his strength when he was in natsus body and he left natsu a portion of his power he had at that time and plus igneels power had nothing to do with natsus previous fights. That was all from natsus own power he didn't start using igneels power until he took the bandages off his arm.