Hao Ren and Hasse sat opposite each other in the centre of the air bubble, and the underwater shadows that flashed past them often cast some mottled light spots around them. Hao Ren asked Hasse, "If there is an instinct which will not help your reproduction and evolution from the viewpoint of biological evolution, and it has nothing to do with getting food or increasing the chance of survival, and it just makes you getting hostile towards other intelligent beings in an incomprehensible way. Do you think this 'instinct' is natural or normal?"
Hasse shook his head and about to stand up. Hao Ren stopped him. "This is a serious question. I hope you will take it seriously."
Hasse said coldly, "Perhaps you are serious, but you don't understand the importance of killing instincts to a demon-hunter. This is the key to our superiority in the alien war for the past ten thousand years."
