Peter DeQuattro, a 25-year-old cook, exited the Mall Ride at Civic Center Station around 8:30 p.m. on Nov. 8, after his shift at a Lower Downtown bar. His next recollection was writhing on a gurney in the back of an ambulance, an eye swollen shut and adrenaline pumping as EMTs struggled to restrain him. DeQuattro, who is white, was one of the most recent men targeted in a downtown-centered spree of attacks where small groups of black men and youths — many with admitted gang ties — tried to knock out white or Latino men with whacks to the head....