When Brown University junior Mia Tretta’s phone began buzzing with an emergency alert during finals week, she tried to convince herself it couldn’t be happening again. In 2019, Tretta had been shot in the abdomen during a mass shooting at Saugus High School in Santa Clarita, California. By the end of the day, two people were dead and nine others injured in the Providence, Rhode Island, shooting that once again upended a school campus.