Four corrections deputies surrounded Darrell Classen as he yelled obscenities and threatened to assault the prosecutor assigned to his case during sentencing Tuesday in Clark County Superior Court. He remained silent, however, as the judge handed down a 20-year prison sentence.Classen, 27, was previously convicted by a jury of holding a woman captive and beating her while inside a vehicle traveling north on Interstate 205 in September 2015. Judge David Gregerson described the incident as “one of the more disturbing cases” that has come before him.The public attack prompted multiple Samaritans to come to the woman’s aid, one of which was an off-duty Vancouver firefighter whom Classen slapped across the face, Deputy Prosecutor James Smith said.Classen was found guilty in October of felony harassment-death threats with the use of a deadly weapon, first-degree kidnapping with the use of a deadly weapon, two counts of second-degree assault and attempted first-degree kidnapping.The jury, which heard about two days of testimony, returned the verdict after about an hour of deliberating.“This was an extremely terrifying experience for the victim. The defendant’s behavior was completely outrageous, and (the victim) is lucky she wasn’t more severely injured than she was. Clearly, (Classen) is a career criminal and is deserving of the sentence he received,” Smith said after the hearing.