Go back to the trailer of zombie and pause at front view of riot shield, you can now probably notice that the car door and image 3 (the trolley) are used or combine in a manner to make the riot shield.
Many of you know who he is well he recently posted a new tweet and updated a bio, I cannot figure out how they would have to do with zombies. Maybe he is just trolling us or maybe one of you can find the connection?