Looking to increase their win streak, the Chargers went home for an AFC West rivalry rematch against the Kansas City Chiefs. In the first quarter the Chargers took control as QB Philip Rivers got a 19-yard touchdown pass to TE Antonio Gates. The Chiefs would reply to tie the game with QB Matt Cassel making a 7-yard touchdown pass to WR Chris Chambers, until San Diego rallied with RB LaDainian Tomlinson getting a 1-yard touchdown run, then Rivers hooking up with Gates again on a 15-yard touchdown pass, then DB Paul Oliver returned a fumble 40 yards for a touchdown. In the third quarter the Chargers dominance continued as RB LaDainian Tomlinson got a 3-yard touchdown run. The Chiefs tried to come back with RB Jamaal Charles getting a 2-yard touchdown run, but the Chargers would pull away with kicker Nate Kaeding making a 55-yard field goal. In the fourth quarter a penalty on Matt Cassel was enforced in the end zone for a safety, giving the Chargers 2 points. The final score was made when Kaeding booted a 23-yard field goal.
Question: How many yards shorter was Philip Rivers's second touchdown pass compared to his first?
Answer: 4