He left the building as he had entered, silent and unseen.  He smiled at the thought of the scene he had left behind, He walked out into the cul-de-sac, it was late afternoon and mothers were walking their children home from school. 

He could smell the stench of blood and flesh and he could still taste the fear. 

He noticed he had grown a little, his posture had straightened, he was calmer, concentrated, his eyes more focused - he was in the zone.