When the stage lights rose before the show on March 14, 2020, at Saint Vitus, a cramped New York City heavy metal bar, the venue felt a little more on edge than normal. In its near decade of shows, dance parties, and drinking, the intimate, dimly lit bar and concert venue, a former plumbing school located in the “ass-end” of Brooklyn’s Greenpoint neighborhood, had become an internationally respected nexus for all things heavy metal. That Saturday night, a noise-rock supergroup called Human Impact would give the last concert before the venue officially announced a shutdown on the 17th. …