Gater was another Soul Transformation Realm Zasfin who was out on another mission. These first skirmishes were happening everywhere that can be considered important to the Zasfins, so the Soul Rulers' experts were being sent to various locations nonstop. Gater just so happened to be working on another task before this battle started.
Gater then looked at the situation ahead and could see how his own side's Soul Transformation members were having a hard time against the Stage Six Demon Beasts. "Four against three, but we're still slightly behind. Don't worry, Senior Jare. I'll join them and force the Stage Six Demon Beasts back. Perhaps we can even kill one or two of them."