CREATE TABLE table_22421 ("Team" TEXT, "Outgoing manager" TEXT, "Manner of departure" TEXT, "Date of vacancy" TEXT, "Replaced by" TEXT, "Date of appointment" TEXT, "Position in table" TEXT)

Name the manner of departure for date of vacancy 25 august 2008
SELECT "Manner of departure" FROM table_22421 WHERE "Date of vacancy" = '25 August 2008'
SELECT "Manner of departure" FROM "table_22421" WHERE "Date of vacancy" = '25 August 2008'