Temporal retrogression might have been something that most intelligent beings once imagined. Everyone would have intended to change certain things in the past to varying degrees, with the intention to alter tragedies so that they would not lead lives of regret, so that there could be perfection.
But time could not be reversed. It would never flow backward within the known universe.
The past was the past, and it could never be saved. However, just as time itself did not exist, there might well be a way to pause time or achieve something as unthinkable as 'reversing time', what with Fattrovi and Joshua's using Steel Authority and Absolute Zero.
