Throughout its history, mixed martial arts have served as a refuge for people disillusioned and confounded by the world at large. People who just want to find some measure of escape within the honesty of primal combat, even if only for a few hours on a Saturday night. It’s no accident that the sport has become so massively popular in such a lonely time. “Fighting in the Age of Loneliness” is a five-part documentary series from SB Nation. It is written and narrated by Felix Biederman, and produced and directed by Jon Bois.