TRENDING:      Tedy Bruschi       Delta       Class ring        Sam Summer       Sharks       MBTA fares The St. Louis Blues bungled their chance to hoist the hardware on their home ice Sunday night. With a 3-2 series lead, the Stanley Cup and Conn Smythe Trophy in the building, an estimated 40,000 fans ready to celebrate at downtown watch party, and the top floor of a local bar rented out for potential postgame festivities, the Blues couldn’t finish the job in Game 6. The Bruins struck first midway through the first period — a goal Berube pegged as an early difference maker. Already on a power play, Boston earned another man-up advantage when Blues center Ryan O’Reilly couldn’t clear the puck and was whistled for delay of game. Fifty-eight seconds of 5-on-3 is a surefire recipe for generating scoring chances, especially when the league’s best power play unit of the postseason is on the attack. Left wing Brad Marchand notched his first non-empty netter score of the series, giving the Bruins a 1-0 lead they would never relinquish. “When you score first, it changes a lot,’’ Berube said. “Obviously, it gives you a ton of confidence and momentum. I liked our start. I thought we wer...