Very well written, I like the “world is dissolving” vibe. All that would be left would be a roiling planet sized mass of nanobots. Hmm… maybe I’ll sequel that…

You have great use of language in this story. Very evocative; both overwhelming and bleak. I especially like these sentences:

“Nanobot Corruption!” was the clinical way to say that a nanobot got the recipe to build a copy of itself wrong and became the last cancer of the world.

Mountains slid into duststorms, lakes boiled away, and valleys leveled into grey silk.

face to face is right!

The raison d’etre of science fiction is to explore and discuss the fears and opportunities that the future holds for us. That’s exactly what you’ve done here; thank you.