COLLEYVILLE — Having stayed with Keller Fossil Ridge through three quarters Tuesday night, Arlington Lamar picked the wrong time to have a cold shooting performance.On the heels of seven fourth-quarter baskets and shooting woes by the Lamar Vikings, Fossil Ridge delivered a 55-46 Class 5A boys basketball bi-district playoff victory at Colleyville Heritage High School.The Panthers (21-8) move on to face the winner of Midland and El Paso Coronado later this week. “We got our defense going in that final quarter and some energy,” forward Chris Kouakou said. “That gave us some better chances on offense and we took advantage of that.”Lamar (15-13) seemed to struggle most of the game, but rallied twice against six- and seven-point deficits. The game was tied entering the final quarter, before Fossil Ridge got hot on a couple of 3-pointers from Kouakou. Both of those gave the Panthers a 48-41 lead and continued a 10-3 run. Lamar was 3-of-13 from the field in the final quarter.“I think we had some jitters early, no doubt,” Fossil Ridge coach Zack Myers said. “All season we’ve been the kind of team that lives off defense so I was glad to see us get going there late.”Fossil Ridge was 20-of-48 from the field and 7-of-11 in the final quarter.Kouakou finished with 14 points as did Bryce Jackson to lead Fossil Ridge.Jackson had 11 of his points in the first quarter and got things going after the Panthers started the game 0-of-13. He had a 3-pointer, then two offensive rebounds and follow shots to give Fossil Ridge a first-quarter lead. Diontae Champion led Lamar with 16 points and Julius Jackson had 13 points.