CREATE TABLE table_27495117_3 (manner_of_departure VARCHAR2, date_of_appointment VARCHAR2)

What was the manner of departure for the appointment date of 21 september 2010
SELECT manner_of_departure FROM table_27495117_3 WHERE date_of_appointment = "21 September 2010"
SELECT "manner_of_departure" FROM "table_27495117_3" WHERE "21 September 2010" = "date_of_appointment"