I wipe my brow and I sweat my rust
“Sweat my rust” is the interesting part here. “Rust” is iron oxide, formed when iron is exposed to air.
Obviously humans wouldn’t sweat rust, so it seems like Dan could be using a metaphor to imply that humans are so controlled and programmed these days that it’s almost like they are just robots. Alternatively, he could be in shock after the apocalypse and unable to emotionally process what is happening — robots also lack emotion.
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