Shares in British hedge fund manager Man Group Plc have fallen following a report that the head of its China unit has been taken into custody as part of a probe into the country's recent market volatility. David Dredge of global hedge fund Fortress has built a career studying, predicting and protecting against the world's major financial crises. The recent convulsions in global share markets are "just the beginning" of a painful adjustment as money drains from the emerging market economies, he says.  "August 2015 will go down in the record books much like July 2007 or July 1997 as...