(Dallas, OR) -- A driver who ran down a man armed with a knife won't face criminal charges. The incident happened last month in the parking lot of a grocery store in West Salem. The Polk County District Attorney's Office says a review of witness testimony and video surveillance showed Luis Velasquez was armed with a knife when he got in a confrontation with a person in the parking lot and threated to puncture the vehicle's tires. The driver fled hitting and seriously injuring Velasquez. The District Attorney determined the driver was threatened by Velasquez and a conviction would be unlikely.