Killing instinct specifically referred to the killing awareness and pre-battle response that demon hunters involuntarily had in the face of unusual creatures. Demon hunters regarded it as a useful talent because killing instinct allowed them to enter into combat mode extremely fast, made them ruthless, and unhesitant when faced against the otherworldlings. More importantly, killing instinct is fundamental to many of the demon hunters' perceptive abilities; 80% of their ability to identify and predict the movements of otherworldlings came from the killing instinct.
Of course, skilled demon hunters could smell any strange odors from the crowd even if they lose this instinct, just like Liu Sheng and Zhao Xi. They could sense the presence of unusual creatures, but they could neither accurately perceive their opponent's race or strength, nor trigger any pre-combat response.
Hao Ren frowned as he looked at Liu Sheng. "What happened before the killing instinct disappeared?"
