Under the suppression of Saintly Power, the Immortal Fire really wasn't much to behold, completely devoid of any resistance.
In fact, if it were just one Sacred Fate Seed or only possessing a single Sacred Fate Seed, the Top-grade Immortal Fire would still have some power to resist; however, who would expect Peter Brown himself to be such an abnormal existence, having obtained not only a multitude of Immortal Fires but also a variety of them? The Saint from the Southland inherently possessed a fiery nature, further suppressing the Immortal Fire completely.
The Immortal Fire, which was under suppression, lost all its power in front of Peter Brown's absorption and was quickly taken into the Sage's World by Peter, where, after being refined, it became a part of Peter Brown's Sage's World.
That's done!
It was only then that Peter Brown breathed a sigh of relief. If it weren't for the suppression of Saintly Power, he was not sure he could have handled the Immortal Fire.