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Double Subverted: ...until an ambassador from a race of Sufficiently Advanced Aliens visits the battlefield and explains it, allowing The Engineer to alter and improve its design by integrating Earthly technology.
Invoked: The machine is half complete when The Hero sees it, and he only has access to it once The Engineer completes it.
Exploited: The enemy is aware that this machine exists. When The Hero is killed, they're able to take control of it and force him to respawn behind enemy lines, where they easily capture him and hold him as a prisoner of war.