Then why does it have zombie reindeer?

Not that I'm complaing, Zombie reindeer are cool.

I'm thinking that is probably from the nanobot scenario; it looks like a swarm of nanobots stripped most of that area, including the deer, on the first pass. Considering those are supposed to be destroying all organic matter, it could very well be a picture of the process still in action (the fog perhaps being the swarms).

Nanobots would be cool. Nigh unstoppable, but cool.