The elf had already asked about travel. It doesn't take a genius to realize that whatever spells Solas intends to use to revive Arabella, he can't do that from here--something a bit to be expected. Gods performed miracles in temples, not in ramshackle huts in the middle of nowhere.

"If you preserve her body and if the journey isn't you leading me on a chase out of sheer pettiness, then I don't mind travel. I can leave shortly after you cast the spell."

After all, it's not like he has family, friends, anybody who he would need to tell them he was traveling.