It's a demonic army of semi-sentient Mata bots and burning cities.

Girl is recalling her dream to Puffy.

Girl: "And then the evil robot army laid waste to all that was free."

Puffy: "That was no dream."

Girl is surprised. Puffy begins rummaging through old things.

Puffy: "Here it is."

He recovers very old newspapers.

Puffy: "That really happened."

The paper:

MAY 20**
BERLINER
-
MATA KILLS THE WORLD
...APPARENTLY ON PURPOSE?