This is a good thing you have!

You should continue this. :3 it would be cool.

wow, that's a creepy twist at the end. it really shows how humans can be monsters sometimes and really reflects on the state of humanity (or a possibility of what it would become in the future). it reminds me of another short story i've read: it's called "the sentry". i won't give anything away though, that'll ruin the entire thing :)

Oh wow, this is ... wow. I'm baffeled and speechless - okay, not so much as speechless but ... damn!
This would be pretty crazy if this were to ever happen. I'm not sure if it's a possibility though, but it does sound cool. Even though there'll be a lot of blood and gore and whatnot. Lol ;))

Short and sweet.

I liked the sentence, "The trees were thin, black needles reaching up into an unforgiving charcoal-grey sky." However, I felt that end of the sentence was loaded with words. I think if you omitted the word,"grey" it would have more impact.

You have a way with pacing, which is something I find very difficult. And I thought the last sentence was very powerful. Great story!