MONTROSE, Colo. - Marcus Klintmalm's two victims lay sprawled on the ground, their weapons released by hands gone limp. Spent cartridge casings, his and theirs, were everywhere -- testimony to two gunfights. The shooting had stopped. It was time to debrief. ''Where did you hit him?'' an instructor asked Klintmalm, referring to one of the assailants. The man was standing now, with a mark of orange wax from Klintmalm's ''bullet'' on his pants. ''In the hip,'' Klintmalm said. If the fight had been real, that might not have been good enough, the instructor said. ''He may not be dead.'' Such...