Beniers pushed it to 3-1 on the rush at 8:36 of the third period, snapping the puck past Swayman from the inside edge of the left circle.
“That was a snipe,” Daccord said. “That was sick. I was so pumped for [Beniers]. Obviously goals in back-to-back games, that’s huge. When he’s going, he’s one of our best players, so we need him firing on all cylinders.”
McCann scored an empty-net goal from Seattle’s zone at 19:41 for the 4-1 final.
“We all know we’re doing stuff well,” said Bruins forward Morgan Geekie, who signed with Boston in July after playing the previous two seasons with Seattle. “We’re a good hockey team. We know what we have in this room, so just a few details we have to clean up. Pucks are going to go in eventually.”
NOTES: Beniers had his first three-point game of the season. … Daccord, a Boston native, played his first NHL game at TD Garden. He has made 30 or more saves in four of his past five starts. … Pastrnak scored his ninth game-opening goal of the season, the most in the NHL.