Enough of this, Logan warned himself. Let’s get on with the job. Fill up with coldness and hate. Build the image of a jackal, a warped coward running from justice. Weak, spineless, selfish. Living beyond his time. Chase, capture and kill.
Seems like, in the book, Logan is much less sadistic and finds less excitement in killing runners. He has to work himself into the mindset to be cold and a killer.