Feb 4 This week's roller-coaster ride in the global crude oil market was likely fueled in part by the sudden liquidation of a $600 million leveraged fund bet on falling prices, market sources said on Wednesday. Unknown investors in the VelocityShares 3x Inverse Crude Oil Exchange Traded Note - which offers the ability to make a bearish bet on prices magnified threefold, with gut-churning ups and downs - bailed out early this week after jumping into the fund in January, ETN data show.