To Erzi, he’s travelling back in time, but to the people in the time loop, they die every reset, replaced by the past versions of themselves. The choices they make are erased; their growth or downfall is undone.
Those who retain memories of past timelines often experience disorientation, confusion, a loss of identity and a sense of nihilism. People who re-witness traumatic events in the form of Soul Echoes can suffer further psychologic damage.