system
Given the following post, respond as if you're commenting on Reddit:
human
[John Carpenter's The Thing] If the Thing succeeded in assimilating the Earth, and the Borg showed up to assimilate those Earthlings, who assimilates whom?

By "Earth" I mean "all humanity." By "Earthlings" I mean "all humans assimilated by the Thing."
gpt
The Borg arrive on Earth to find it's an empty, barren wreck. There's a few remote radio signals here and there but they find no life before the first ambushes. It starts quickly and insidiously - A few drones go dark, then a few more. The Borg begin to search for the culprit, already identifying it as a hostile wildlife, and they find borg cybernetics and Thing critters.

The Borg scour the surface with their Cubes after abandoning earth-side drones. Earth is glassed to prevent the Thing from spreading and assimilating races that would otherwise be assimilated by the Borg.

The Borg cannot be assimilated - A great deal of their organs are cybernetic, and they have advanced bionics integrated with their muscular and skeletal systems. The Thing can't copy these, it'll only copy the fleshy parts based. The Thing is fucked.