At Rush's insistence both he and Scott have got their scarves and hoods up to try to mask their faces from the police drones that float constantly above their heads. Most of the rest of the marchers have done the same: if not hoodies or scarves then actual masks - 3D-printed re-creations of too many other black men and women slain by the police, to keep their memories alive as much as to hide identities, as if vengeful ghosts have been summoned to march with them.