First experiences can set in motion forces that course through a lifetime. A quietly traumatic initiation into adulthood is the subject of the short film “Snow in September,” in which the Mongolian director Lkhagvadulam Purev-Ochir examines how a confusing encounter with an older woman upends one teen-age boy’s relationships and changes the way he moves through the world. Watch the film in its entirety at the link in our bio.