Metallica debuted their new stage set up, which commemorates three decade of history, last night (July 28) in Mexico City during the first of eight shows at Palacio de los Deportes. During the performance of ‘Enter Sandman,’ one of the onstage flare launchers malfunctioned. Two stagehands inspected them, only to be engulfed in a huge flame. You can see video of the pyro-gone-wrong below, with one man appearing to be