Nemesis Periscope

The silver periscope protrudes from the soil like a metallic blade, its shiny cylinder emerging from the crash site earth in silent menace. Two policemen mistake it for vegetation until it ruptures without warning, releasing an alien gas that quickly incapacitates them where they stand. The device's sudden mechanical violence exposes the Nemesis comet not as inert debris but as an actively hostile time-altered weapon, its polished exterior concealing a lethal defense mechanism.