context: Nothing RB LaDainian Tomlinson does on the ground really impresses the San Diego Chargers at this point. For that, the star running back must take to the air. Tomlinson seemed to be trying to jump out of Candlestick Park while hurdling the goal line on one of his four touchdown runs&#8212;and his elevation was the Chargers' inspiration. Tomlinson set a franchise record while seemingly spending most of the afternoon in the end zone, and QB Philip Rivers passed for a career-high 334 yards and two more scores in San Diego's 48-19 victory over San Francisco. Tomlinson got his third score 33 seconds before halftime, capping San Diego's 35-point first half and essentially finishing off the 49ers (2-4) with an astonishingly high leap over the goal-line pile. WR Bryan Gilmore and FB Moran Norris caught scoring passes as the Chargers gave up more points in the first half alone than they allowed in any of their first four games. But San Diego shut out San Francisco in the second half, with QB Alex Smith finishing 20 of 31 for 214 yards. San Francisco's offense has been better than expected heading to the club's bye week, but the defense has been just as bad as feared. Two weeks after giving up 41 points to the Chiefs, the 49ers seemed lost from the moment top CB Walt Harris was ruled out with a hamstring injury. This crushing blow put the 49ers record at 2-4.
question: How many points did San Diego score in the second half?
answer: 13