Heartbreaking in part because of its simplicity. Will's brother has been killed. Will KNOWS who did it and his world is bound by rules, one of which is revenge. As Will rides down in the elevator on his way to take revenge, a new person gets on at every floor. Will, over and over is shown the chain that "the rules" have tied him to.
Reynolds has trimmed all excess from the core problem of lives based on "the rules" without sacrificing character or plot. His quick lines are like a punch to the gut, and Reynolds doesn't leave us, or Will, with easy answers or aphorisms.