CREATE TABLE table_48703 ("Team" TEXT, "Outgoing manager" TEXT, "Manner of departure" TEXT, "Date of vacancy" TEXT, "Replaced by" TEXT, "Date of appointment" TEXT)

How did the manager replaced by Michael Oenning depart?
SELECT "Manner of departure" FROM table_48703 WHERE "Replaced by" = 'michael oenning'
SELECT "Manner of departure" FROM "table_48703" WHERE "Replaced by" = 'michael oenning'