Chen was waiting for the monster ballistic to open an attack again, only then he would be able to shoot them down.
Given Albert's help in controlling the Golem and learning its function in such a short period of time, Chen is now able to focus on killing the ballistic monsters, which are currently hidden within the forest and the mountain area.
While with their earthen ability of camouflage, they are able to hide their presence completely.
Even for his map modules in the different settings, he is not able to search them at all, only when they had a certain kind of movement he is able to capture them and shoot.
"Sir! There are enemies from the southern part too, and every one of them does not completely look like some normal zombie."
From the southern gate post, Chen got a piece of news from a guard that was designated that area.