"Uncle Bob. I did as you asked, the sentry drones are still active."

  "How's the ammo?"

  "It's alright, but they keep coming, and the smell's horrible when the wind changes."

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  "Sorry, Tommy, we can't clean 'em up. We gotta protect what's ours."

  "Why do they keep coming?"

  "Well, Tom, we can't touch humans or animals. It spreads everywhere and won't die out. They want our farmland. But we ain't gonna let 'em have it. We gotta survive."

  "What'll happen if we run out of ammo, uncle?"

  "I ain't worried bout that—they'll run out before the ammo ever does."