Margaux Isaksen of the U.S. (L), Brazil's Yane Marques (C) and Britain's Samantha Murray react as they finish the combined event of the women's modern pentathlon during the London 2012 Olympic Games at Greenwich Park August 12, 2012. REUTERS/Darren Staples (BRITAIN - Tags: OLYMPICS PORT MODERN PENTATHLON SPORT TPX IMAGES OF THE DAY)