The battle had become one-sided as soon as the invading forces gained the smallest advantage. It was enough for them to have one solid stage cultivator in the fifth rank free to help in other fights for the situation to snowball.
Noah had helped Elder Julia, they had helped all their allies, and all the assets of the Hive had supported the other factions. The outcome was a complete defeat of the higher-ups of the Empire. The Second Life formation had saved most of them, but some died nonetheless.
The weaker assets of the Empire felt forced to retreat at the sight of that event. They knew that stronger cultivators rarely joined battles on a lower level, but the fight was over. Remaining on the battlefield would push the higher-ups of the invaders to intervene to limit the casualties on their side.