TRI CITY -- Not too many teams have been able to break through the South Umpqua High School football team's defense this season.Especially lately.The Lancers, who advanced to the second round of the Class 3A state playoffs with last Friday's 28-7 victory over Yamhill-Carlton, have had one of the state's stingiest defenses as of late. That defense, which allowed more than 30 points twice in its first five games, has allowed only a pair of touchdowns in its last three and is one of the main reasons the Lancers made the playoffs, and advanced in them."The loss to (Brookings-Harbor) made …