http://www.freep.com/entertainment/music/encore15e_20050715.htm BY BRIAN McCOLLUM FREE PRESS POP MUSIC WRITER On Eminem's new summer tour, a tense video storyline is woven through the Detroit rapper's show. Following a montage of visuals encapsulating his vast celebrity -- magazine covers, TV footage, limos, crowds -- the star is seen alone backstage, aiming a loaded pistol at his image in a mirror before turning it toward himself. The climax is abrupt: With the gun to his temple, Eminem pulls the trigger. The screen goes black. When the dressing room eventually fades back into view, the audience sees that the rapper sits unharmed; the gun has misfired. Eminem looks into the camera. "This is how you go out with a bang, baby!" At a casual glance, it might come off like the latest shock attack in a career defined by controversy. But dig a bit deeper and you'll come upon a revelation even more startling, one that has been known only to the artist's closest friends and associates. Marshall Mathers is ready to get rid of Eminem.