Users can "save" the current moment in time and return "later" to that point. For everyone else the time between saving and the moment the user decided to return simply didn't happen, even the user keeps only the memories of what happened. In practical terms, it could be considered highly accurate foreknowledge of the future. Just like in a video game, this power has the unique ability to reload time after your death; as such, death is a concept that's unimportant to the user.