 Despite this concern and the obvious conflict of interest involved in having Fastow run it, the accounting firm Arthur Andersen approved it.In April 2000, owing to the decreasing value of Rhythms stock and a calculated 68% chance that the hedge would default, Enron unwound the transaction.As per agreement, Swap-Sub took from Enron its $207 million in Rhythms stock, but instead returned unrestricted Enron stock supposedly valued at $234 million.