How can I separate the monster from the person?

Jason is still sitting in his car, fighting back tears that are running down his face. Jason talks on the phone to his uncle. "Uncle Ivan, I don't think I will be available to do this, it looks as though I just killed a young man, how can I separate the monster from the person?" "You have to my boy, have you not seen the mutilated bodies they leave behind, if you had let that young man live he would eventually kill an innocent family like they killed yours, so toughen up and do your duty." Uncle hangs up the phone and there is a determined look on Jason's face.

The next morning Jason enters the police station where he works, He is wearing dark sunglasses to hide the dark rings under his eyes that he got due to lack of sleep. As he walks into the office he is stopped by Frank, who is assisting him on the various murder cases. "Detective Silverman, we have another body and you need to see this one, this guy has an arrow through the heart!" Frank shows him a picture of the dead bo