The humdrum of Thursday morning erupted into pandemonium as two cars raced along Spanish Town Road in Kingston. One got out of control, mowing down five students of the Tivoli Gardens High School. Horror and chaos ensued as screams pierced the morning air. At minutes past 7 a.m., what should have been a regular morning walk to the bus stop on November 15, 2007, turned into a nightmare for 15-year-old Roxanne Johnson, who was pinned against a barbed wire, left…