Soulless
"They are still alive."
While their group was busy struggling to maintain control of the beast horde that was attacking them ferociously, Hei Gou was feeling more and more influenced by the heavy grief and despair that shrouded the bodies of the beasts.
Although he did not pause his actions as he cut down one beast after another, he still did not manage to protect his mind from the despair that was surrounding him.
He could feel the grievances that these beasts had, but he also knew that there was no way he could stop and try to speak with them to find out the cause for their lack of control over their own bodies.
Also, even though they were still alive, the festering flesh on their bodies was clearly infected and inflamed. They would not be able to survive for long either way, so killing them might even lessen the amount of pain they would have to go through.