user: Question: How did the manager replaced by Michael Oenning depart?
Columns: ['Team', 'Outgoing manager', 'Manner of departure', 'Date of vacancy', 'Replaced by', 'Date of appointment']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1. FC Nuremberg', 'Thomas von Heesen', 'Resigned', '28 August 2008', 'Michael Oenning', '5 September 2008']
SQL:

assistant: SELECT "Manner of departure" FROM "Table" WHERE "Replaced by" = 'Michael Oenning';