After seeing the last notification from the system, Vaan was suddenly enlightened.
He had always felt something wasn't right when he received the horrible visions of himself slaughtering witches, including his close and loved ones.
In those visions, his other self was completely foreign to him and held great hatred towards the witches. In fact, that other him couldn't tolerate anyone or anything that slighted him.
It was clear that he had a terrible history for him to turn out that way.
Originally, he thought his Fourth Dimensional Sense had touched upon his alternate self from a parallel timeline.
However, Vaan couldn't have been more wrong.
In reality, the other version of himself was still him all along. However, his memories and all of the events leading up to the present and future were all deleted from history.