The battle between the Collapsing Lightning Alliance and the Inferno Daemon Invasion Army lasted nearly thirty minutes before the force field emerging from the Trinity Dark Towers suddenly began to expand.
Cain was battling against Zinir with all he had when he noticed the sudden enlargement of the force field. While he could resist this one, if he were trapped inside, the God Towers would not only enhance his enemy but also suppress his energy, which was not wise. Instead of risking his life to kill the Abyssal God, he rose to the sky, out of the force field's range.
Like Cain, all the Divine Ascension Masters and Apotheosis Masters did the same, choosing to ascend into the sky, escaping from the force field. And while they did that, the Inferno Daemon Invasion Army warriors flashed back to the God Towers, heading into the teleportation formations.