A man cut his own neck Thursday afternoon during a confrontation with Washington State Patrol troopers at a Vancouver car dealership. He was not seriously hurt, an official said.Before the confrontation, around 12:35 p.m., a man was reportedly walking along Interstate 205 north near Highway 500, said Trooper Will Finn, spokesman for the Washington State Patrol. The man, identified as Marvin Nelson, 35, of Yakima, was spotted heading northeast in the bushes toward Vancouver Toyota, 10455 N.E. 53rd St.When the trooper confronted the man in the used car section of the dealership, he said he was out for a walk, Finn said. The trooper explained that pedestrians can’t be out on the highway and started to check Nelson’s name and date of birth for any criminal history.Nelson told the trooper he had a pocket knife, and the trooper said that was fine. After a second trooper showed up, Nelson put the knife to his own throat and waved it around his neck, Finn said. The troopers told him to drop the knife, but he ignored their commands. Nelson started to bleed a little bit from his neck, Finn said.They instructed Nelson to drop the knife three times, but he continued to cut himself. The troopers subdued him with a Taser to prevent him from hurting himself further.