The Superior Demon Spirit used his powerful soul force to create a soul barrier around him. Unlike the transparent woman, the Superior Demon Spirit was a real spirit. Although it was able to rearrange its exploded parts, it doesn't mean that it didn't suffer any damage. In fact, it suffered a lot. It had lost a large amount of its soul power.
If it suffered the same fate again, it means it will again lose a lot of soul force and its strength will once again weaken.
It doesn't want to suffer any more injuries.
Ye Xiao's attack had also dealt great damage to its body. If it was again wounded, it would not be able to rearrange its body parts like before.