Two shooting co-defendants who police say alternated using an assault-style rifle and a Glock Model 30 .45 caliber pistol appeared before DC Superior Court Judge Judith Pipe on May 19 for a pre-trial hearing. Tyjuan Liggins, 29, is facing a sixteen-count indictment for assault with a dangerous weapon, endangerment with a firearm multiple projectiles, possession of a firearm in a crime of violence, unlawful discharge of a firearm, destruction o…