The battlefield was never a matter for just one or two people. Even someone as powerful as a Quasi-God felt powerless in the face of a plane war.
The collapse in the direction of West Hill Mountain wasn't simply a matter of one line being broken.
It was as if a checkpoint had been torn open, and when the "Iron Cavalry" streamed out, the misfortune fell upon the entire area behind it.
Once the Abyssal Insect Swarm had breached the defense line, they immediately showcased what this race excelled at: multi-lined operations.
They dispersed in several directions to conduct rapid raids. Escapees were nowhere near as fast as these hunters. This led directly to the tragedy that scores of cities were slaughtered overnight.