Fence boards exploded in every direction in a Grant Avenue alley near Sutter Street at 5:20 a.m. Friday when the driver of a late model Hyundai allegedly ran down a 20-year-old man on foot behind his home and crashed through rear fences in three back yards. The victim, Sergio Behar, 20, who lived nearby was rushed to San Joaquin County Hospital by ambulance in critical condition before being airlifted by helicopter to a Modesto trauma center with multiple serious injuries, according to Manteca Police. Several neighbors said they were awakened by the sound of the crash and ran from their homes to see the victim lying in a wet area of the second home’s rear yard.