Yes. I think it presages the end of the world.

The other one, the rust-colored one, was probably not a shadow but a reflection off the side of the truck.

Stand in a dark room and turn a directed light (like a spotlight) on yourself. Then turn on another one 90 degrees to the first. You'll cast two shadows. Keep adding lights and you'll cast more shadows. You can do this with a mug and some flashlights, or just watch a stage performance.