The entire novel moves on elevator time, right? Will's descent is literally measured in floors, but the ghosts that board are all echoes from his past, each one a consequence of a choice he or someone in his family made. His father, his uncle, his brother's friend—they're not just random spirits. They're living proof of the cycle he's about to step into.
Seeing his uncle as a young man, broken by the same code of revenge, that’s the first major crack in Will’s resolve. He knew the story, but putting a face to it, hearing the regret from the ghost himself, makes it visceral. Then Dani, showing him the child he was, the one who didn't yet know about The Rules. That past innocence is the direct counterpoint to the hardened teenager holding the gun now.
The plot isn't just influenced; it's constructed by the past. Every floor reveals a new layer of history that chips away at his certainty. By the time he reaches the lobby, the gun feels less like a tool for justice and more like the weight of every tragedy that came before him.