Kristoffer Borgli’s new video for Young Dreams’ “Fog of War” pits the band’s soaring, bleary-eyed, optimistic sound against a narrative dealing with the dark, often destructive dissipation of adolescence. The video plays a bit like a short that one could easily imagine being turned into a feature-length drama styled after unsettling and slick productions like The Virgin Suicides or Martha Marcy May Marlene.