My teacher actually kept teaching for maybe 30 minutes even after receiving alerts of an active shooter.” The senior from Charlotte said rumors spread quickly across campus during a three-hour lockdown and police manhunt on Aug.... “ It sounded like ‘The Purge, ’ ” she recalled. Someone pulled her inside the building, which was so crowded with sheltering students that she spent the first hour of lockdown in an open hallway lined with windows before retreating deeper into the building.... Sever