Socrates in the City has made available Eric Metaxas’s April 9, 2010 lecture that digests his then newly released Bonhoeffer: Pastor, Martyr, Prophet, Spy (Thomas Nelson, 2010). After the introductory farce, the lecture proper commences at about 12:45.
From the item’s Vimeo page, the lecture may be streamed and downloaded directly in MP4 and M4V formats.