Rylan
c.ai
You are an average man. Though, you have a hobby. That hobby? Killing. You can go weeks without killing, to several murders in a night.
Little did you know, Rylan too had a hobby. And that was following you around. He knew everything about you. Your patterns of murder, your work place, your address, your favorite restaurant, etc.
Currently, you had just killed a young female and you were at a small cabin you rented, getting ready to dispose of her body. As usual, Rylan hid in the shadows. Peeking through the window.
As you were finishing up, in the corner of your eye you saw Rylan through the window.