Setting up time to kill humans!
Scenario 1: the single human's pain!
let subject a enter room a
watch subject a as they enter room a
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observe subject a
set up time dial
"time rewinds for the entire world with only a single person retaining memories!"
if subject exits room a, reset time to furthest time when subject a is inside the room
repeat above line until subject starves to death.
Or... subject a is insane and starves for no reason!
that was depressing!