Even if the God of Seals didn't foolishly present himself, the Flame Giant Surter, who had prepared well in advance, had already split himself, creating a division that could be killed if it weakened, ensuring the barrier would not take effect.
However, this did not mean that Flame Giant Surter could not be defeated. All one needed to do was wait for the blind nun to make contact during Ragnarok and persuade Flame Giant Surter to volunteer for a fight to the death.
Otherwise, Flame Giant Surter's line of thought was to burn the world by all means necessary. Even if it meant avoiding a fair fight with Ahtal to achieve this goal, it would be worthwhile.
As for everything else, he did not care.
"Please wait for me for one day... no, half a day," the blind nun clasped her hands together and spoke to Ahtal, "I will definitely create an environment for you to slay Flame Giant Surter."