An off-duty Clark County firefighter offered help early Sunday morning in Beaverton, Ore., after he witnessed a hit-and-run vehicle crash in which a pickup truck collided with a motorcycle, seriously injuring the motorcycle’s driver, according to the Beaverton Police Department.The crash, near Southwest 139th and Tualatin Valley Highway, took place shortly after midnight. Clark County Fire District 6 Capt. Scott Taube helped the motorcycle’s driver until emergency crews arrived. Just before the crash, the motorcycle was traveling at about 45 mph in a westbound lane on Tualatin Valley Highway. The truck was traveling east on the highway and started to turn left onto 139th, hitting the motorcycle head-on, police said.At the same time, Taube of Hillsboro, Ore., was driving his family home after catching a late movie for his daughter’s 18th birthday. “I told my wife, ‘There’s been an accident, can you call 911?’ ” Taube said Sunday.He approached the scene and noticed the truck’s air bags had been deployed, but its driver had fled. Taube then found the motorcycle’s driver on the curb, about 30 feet from the point of impact.