3 meters to the rear is the main firepower defense line composed of 12 people, including 4 who are wielding the only four high-pressure water guns. They are also from the original X brigade. They are responsible for launching the first wave of interceptions against the swarm, as well as subsequent sustained firepower suppression.
Each person is also assisted by 2 volunteer crew members for cover and substitution.
The third line of defense consists of supply and cleaning teams, responsible for refilling the water tanks and cleaning excess water from the deck. They are also equipped with lower-tier weapons like the Water Sprinkler Gun. The girl with glasses carrying a composite bow is among them. When unexpected casualties occur on the front line, they must fill in immediately, and if there are no accidents, they also need to carry out mosquito extermination after the main battle ends.
At the very rear are Captain Zhou Xuanting and Lin Huan.