“You know what I was thinking about on my way home? How different my life would be if you’d made that gash a little deeper. Or how different yours would be if I’d vaulted myself off a roof nine years ago. Do you ever think about things like that? Like, if either you or I wouldn’t have made it, where would the other one be right now? It was something I thought about all the time: how death changes every remaining moment for those still living.”