Well, you didn’t think that half dozen the Bruins scored against the Islanders on Wednesday would be the start of something big, did you?

On Friday, the B’s scored the first goal of the game before everyone was in their seats at the Garden and then didn’t score again, losing to the Pittsburgh Penguins, 2-1.

Philip Tomasino got the game-winner in the third and then Tristan Jarry shut the door..

The first half of the first period was entertaining as both teams went up and down the ice, with too many odd-man chances for either coach to enjoy.

But it was the Bruins who cashed in on one of the chances.

On a pretty tic-tac-toe play from the third line, Trent Frederic took a feed from Tyler Johnson and Frederic in turn made a nice dish to a wide-open Charlie Coyle at the right circle. Coyle picked his spot under Jarry’s glove for his fifth goal of the season and first point of any kind in five games. It was Frederic’s first point in in six games. It was just 1:24 into the the game and it felt like this was going to be a 6-5 affair.

That didn’t happen.

Jeremy Swayman needed to be good in the first, and he was. His best sequence came when Sidney Crosby broke in all alone. Swayman stopped the original shot and kept his position well enough to turn away Crosby’s nifty follow-up from in-tight.

The Penguins were starting the second period with 1:39 of power play time after an odd sequence. On a delayed penalty on Johnson, Evgeni Malkin was parked at the blue line in front of the Bruins’ bench. As he drifted away from the bench, his Russian countryman, Nikita Zadorov, nudged him with his stick. Malkin responded with a wild swing of the stick, which the refs caught. They had to go to the video to see who the Bruin culprit was and, sure enough, they nailed Zadorov. Both he and Malkin went off for two minutes apiece.

The B’s killed off that penalty in the second, but the Pens continued to test Swayman.

First he had to made a quick pad save on a deflection off Charlie McAvoy’s leg. The rebound went into the slot but Swayman managed to get a piece of Tomasino’s shot to deflect it over the glass.

A little later, Anthony Beauvillier had a clean look off the rush but Swayman flashed the glove to preserve the B’s one-goal lead that was looking slimmer by the minute.

He couldn’t hold the Pens off forever. Even with a Bruin power play, the ice began tot tilt in Pittsburgh’s favor until finally, with .8 seconds left in the period, the Penguins got the equalizer. Crosby collected an Erik Karlsson shot behind the net, circled and fed Rickard Rackell, who roofed it over a sprawling Swayman.

Through two periods, the Pens were outshooting the B’s 27-20. Through the first four games of Joe Sacco’s tenure, the B’s had not allowed more than 25 shots in a game.

Both teams had some checkered third period histories. The Pens had been outscored 13-1 in the third in their previous eight games while the B’s had not scored a third period goal at the Garden since the first home game of the season.

But second period trends continued in the third, and the Pens took the lead at 7:26. Pittsburgh won several puck battles down low until Malkin fed Tomasino and, from the inside of the left circle, Tomasino’s off-speed shot beat Swayman through the pads.

The B’s had chances to even it, including on an unsuccessful power play with 7:00 left in regulation. Jarry made a great late save on a deflected Andrew Peeke shot and then Karlsson stoned Elias Lindholm on the rebound.