"On 14 February 2018 a former pupil entered Marjory Stoneman Douglas High School in Parkland Florida armed with an AR-15 semi-automatic rifle. After six minutes and 20 seconds of carnage, three teachers and 14 of Cameron Kasky's fellow students lay dead. The geography teacher Scott Biegel, whom Kasky had known well, died protecting his students from gunfire. When the shooting broke out, Kasky had been rushing to pick up his younger brother from a special needs class. Hustled into the nearest classroom, the brothers spent the remainder of the attack hiding in the dark, not knowing if the door would be opened by the shooter or a rescuer."