Only Glass would be able to empathize with a rattlesnake that would gladly eat his face off given the chance. What's more, he seems to identify with it. Weird, huh? In case you haven't realized it yet, Glass has a rather unique relationship with the natural world—unlike his peers, he sees himself as a part of it.

It helps that Glass spent a year or so with the Pawnee Tribe. This experience not only allows him to better relate with his American Indian peers, but also to utilize a skillset most trappers don't have access to.

Glass keeps himself sane by focusing only on the task at hand rather than worrying about what might happen in the future. To do otherwise would surely lead to, you know, something like madness.