Richmond got a head start on prepping for its Class 3 District 8 semifinal game in 11-man football, Spartans varsity coach Nick Persell suggested Monday. Richmond (6-3) will face Cameron (46) at 7 p.m. Friday at Spartan Stadium. The Dragons helped secure the postseason meeting by thumping Benton of St. Joseph 48-12. The Spartans were expecting to play the Dragons, given that Cameron had routed Benton 43-8 during the regular season, according to Persell. Having a sense of who their opponent would be gave them an extra week to prep to face “a team that … probably takes two weeks to prepare for,” he said in the multipurpose building on the high school campus. One reason Richmond needed the heads up and the extra prep time was Cameron’s offense. As Persell, his staff and his players have learned from studying game video, the Dragons operate out of the flexbone offense. “Any time you’re facing a triple-option team, you have to be a very disciplined defense and everyone has to do their…