Ranch owner Paul Barnes was packing for a trip to California on Jan. 4 when a little white car came up his driveway."He said, 'My radiator's overheating, can I get some water?' I told him, 'There's a hydrant over there, go help yourself.' Right about then is when every cop in Douglas County showed up," Barnes said.That's how Barnes found out that the driver of the vehicle was more than a motorist in distress. He was Jarell Williams, 26, who is accused of robbing the Topsy Lane Bank of America by claiming he had an explosive device duct-taped to his …