The palace hall was gone, but it could still be rebuilt. If the entire Divine Realm of Asgard were destroyed, then Asgard's line might still survive, perhaps even rebuild, but the Divine Realm of Asgard itself would likely never be restored.
Although the Divine Realm of Asgard was not Thor's only path to becoming stronger, the World Tree was still within Asgard, and it was tied to the Rune Power Thor had comprehended. Naturally, Thor could not give it up lightly.
On top of that, Thor had not been on the throne for long. Before he had even made Asgard more prosperous, if he directly allowed the Divine Realm of Asgard to be destroyed, he would not be able to save face no matter how one looked at it.
So Thor wanted to see if there was a way to get Surtur out of Asgard—such as suppressing Surtur's flame power, making him briefly lose the ability to resist, then using the Bifrost to throw Surtur out of Asgard.
It did not matter where he was thrown, as long as it was not within Asgard's borders. As long as Surtur was teleported away, Thor could be considered to have successfully dealt with this great menace prophesied to cause Ragnarok.
Unfortunately, Thor had already tried very hard, but he still could not inflict any real stagger effect on Surtur, much less suppress Surtur and make him lose the power to resist.
Meanwhile, on Nidavellir, the Bifrost had already delivered the Asgardians and the dwarves, who had not returned home in a very long time, back here.
Looking at the traces of the previous battle left around them, Eitri sighed softly. He had originally thought he would never return here again, because the dwarves had completely become Asgard's vassals. But Eitri had not