Ok so at 7s if you watch it slowly you see that there is a figure in the middle door holding a gun which if you look closely he is zoomed in at me which he then shoots, i respawn and look at the door to see Zoom running away. I believe its pretty obvious that its him. i killed 2 people whilst i was "raiding the entities" (drug labs - morphine) one of them was zoom as i went over before and he was there.