After killing the big guy, Song Shi was not in a hurry to shoot again and continued to observe.
Armor-piercing bullets were very precious. He had only obtained ten of them and there was a limited number of them. Naturally, he had to kill as many high-level mutated beasts as possible.
According to his understanding, the military credits obtained from killing Level 2 mutated beasts were two to three times that of Level 1. Level 3 was three times that of Level 2.
If he killed a Level 4 mutated beast, the military merit he would obtain would be ten times that of a Level 3 mutated beast. In other words, the level of the mutated beasts he killed was higher. One could be equivalent to three or even ten mutated beasts, and the total military merit he would obtain in the end would be even higher.