He realized the Dark Light wasn't just showing him a different world; it was swapping his reality for another. To bring the "Light" back to the Gray, he would have to give up everything that made him a part of it.
In the center of the ruins, a man stood blinking at the brightness. He didn't know who he was or how he had gotten there. He only knew that for the first time in his life, his shadow was sharp, black, and perfectly clear. Dark Light
(how does the "Gray" economy work)? Change the ending (what if the Dark Light was a trap)? Characterize the sister (what was her role in his journey)? He realized the Dark Light wasn't just showing