this post was submitted on 24 Mar 2025
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The "uncaused action" version, similar to Stross's Palimpsest. The traveller goes back and by changing the past creates a future where the chain of events that led them to go back may no longer occurr.
With a dash of "anchored time device", as seen in Primer, where the traveler can't go back any further than the activation of the device that brings them back.