The Rusty Anchor Tavern’s “Battle of the Grunge Gods” drew students, seniors, and one man calling himself Tony Flippen, who clutched a Diet Coke and muttered about “artistic integrity.” Contestants had to do one Creed and one Pearl Jam, judged on accuracy, stage presence, and what the emcee called “spiritual channeling of the rock gods.” Early standouts included a barista who head-banged through “Jeremy” and an insurance adjuster whose Vedder mumble baffled the judges. The night belonged to 67-year-old librarian Dorothy Kowalski, whose lifetime of shushing translated into surgical Pearl Jam runs. “I’ve been listening to Ten since my ’92 divorce,” she said, pocketing a $50 Guitar Center card. Seventeen-year-old Marcus Williams took second with an earnest “With Arms Wide Open.” “I thought about my goldfish,” he said, as strangers sought spiritual guidance. Flippen grew agitated, heckled “Higher,” and was heard rehearsing in the bathroom. He placed third, knocked over an Eddie Vedder cutout, and slipped out. “Great passion, chaotic vibrato,” said a postal worker. Next month: Nickelback vs. Matchbox Twenty. Security already upgraded.