Student tells how classes turned to horror at hands of rampaging gunman . She says two teacher shot when she put herself between the gunman and a student . Students jumped from windows to escape killer . Gunman killed one people in one German towns near Winnenden .
Student tells how classes turned to horror at hands of rampaging gunman . She says one teacher shot when she put herself between the gunman and a student . Students jumped from windows to escape killer . Gunman killed 15 people in two German towns near Stuttgart .