Second halves have been a Pistons bugaboo this season, turning impressive showings to disastrous finishes and a sub-.500 record that has the locker-room collective shaking its head. But when they put it together for stretches, particularly from the point guard spot, the pieces to the puzzle make it appear this grand experiment can work in a disjointed Eastern Conference. Brandon Jennings led a 21-7 third-quarter blitz that allowed the Pistons (14-16) to pull away and stay away from the Cleveland Cavaliers, 115-92, Monday at Quicken Loans Arena. The road win was the Pistons’ seventh in their last eight tries, as they increasingly find a comfort level in someone else’s building. Jennings played perhaps his strongest floor game as a Piston, with 21 points on just 11 shots with 13 assists. Josh Smith scored 20 of his game-high 25 in the first half as the Pistons took a 21-point lead before it was cut to 10. “We gotta do a better job of starting third quarters out,” Smith said. “We’re not good enough where we can cruise through games, and they made an early run.” Then Jennings created every Pistons basket over the last four minutes of the quarter, including picking Kyrie Irving’s pocket, leading to an Andre Drummond dunk, which was followed by another Drummond dunk when Rodney Stuckey matched the feat against Jarrett Jack. “I didn’t want to lose a lead,” Jennings said. “We’ve been struggling in the second half, start of the third. They made a run, but we were able to contain it.” That was just the final 25 seconds of the quarter. Jennings dominated, quietly, hitting triples and dishing to Smith for layups on consecutive plays after scoring a quick five straight when the momentum could’ve turned against the Pistons, as it has in home games. When it was suggested Jennings’ fifth 20-point, 10-assist performance was his best, Pistons coach Maurice Cheeks shone a little light on his expectations for Jennings. In short: He wants more aggression, despite the controlled play. “I kept telling him to be more aggressive in terms of attacking the rim,” Cheeks said. “If he has open shots, go look for them, but I wanted him to be more aggressive. He played a strong floor game.” “He’s got to take a few more chances on offense.”