BOSTON — Steven Stamkos wanted to make something happen. Coach Guy Boucher said it was not the right time.
And really, if Stamkos' shot had hit the net, perhaps we're having a different conversation.
But it didn't, and with Lightning defenseman Eric Brewer too far forward on the rush, the Bruins gained a two-on-one that ended with Brad Marchand's power-play goal with 2:16 left in the third period and a 3-2 victory Saturday at TD Garden.
It was the fourth straight loss and fifth in six games for Tampa Bay (9-11-1), which had been up 2-0 in the first period on power-play goals by Stamkos, his league-best 15th, and Alex Killorn.
"I was trying to get the puck on net," Stamkos said. "That's the way things are going right now. When things aren't going your way, you don't get the bounces, and that was not a good one."
"We were on a penalty kill," Boucher said. "Our defenseman jumps into the play. We're thinking offense. We're not thinking the right thing on that one."
And that's what so bothered Boucher, whose team battled hard to rebound from Thursday's debacle at the Rangers.
"We gambled and wasted 58 minutes of intelligent, paying-the-price work," he said. "We're trying to break that offense-first mentality. We've got to break that."
The Lightning also needs to cut down on defensive breakdowns such as the one that led to Rich Peverley's goal 4:39 into the second period — 77 seconds after Tyler Seguin's power-play goal — that made the score 2-2.
Tampa Bay also failed on a four-minute power play at the end of the second period, though scoring twice on Boston's top-rated penalty kill is notable. But the mistakes on Boston's last goal, with Brendan Mikkelson off for four minutes for high-sticking, were excruciating.
Brewer made a terrific play in the defensive zone to get the puck away from Marchand. But after pushing the puck to Stamkos, the defenseman followed into the offensive zone.
When Stamkos' long-side shot missed the net, the puck rimmed around the boards and sprang Patrice Bergeron and Marchand on a two-on-one against Victor Hedman.
Marchand's high shot beat goalie Mathieu Garon 37 seconds before the penalty would have ended.
"We can't do that," Boucher said. "That's why we're not where we want to be. Those are the things we need to learn. The young guys need to learn, and the old guys need to show the way."
"I have confidence in my shot to get it on net," Stamkos said. "If I do it again, maybe I shoot short side."
First Period—1, Tampa Bay, Stamkos 15 (Purcell, M.Bergeron), 5:32 (pp). 2, Tampa Bay, Killorn 3 (Purcell, St. Louis), 8:38 (pp). Penalties—Lucic, Bos (interference), 5:11; Aulie, TB (unsportsmanlike conduct), 5:45; Campbell, Bos (unsportsmanlike conduct), 5:45; Ference, Bos (tripping), 7:46; Labrie, TB, major (fighting), 8:57; McQuaid, Bos, major (fighting), 8:57; Seidenberg, Bos (boarding), 10:45; Aulie, TB (interference), 13:12; Lucic, Bos (boarding), 19:51.
Second Period—3, Boston, Seguin 4 (Hamilton, Krejci), 3:22 (pp). 4, Boston, Peverley 3 (McQuaid, Paille), 4:39. Penalties—Brewer, TB (interference), 2:04; Crombeen, TB, major (elbowing), 4:44; Campbell, Bos, major (fighting), 4:44; Lecavalier, TB (boarding), 6:29; Pandolfo, Bos (boarding), 9:28; Ference, Bos, double minor (high-sticking), 15:49.
Third Period—5, Boston, Marchand 11 (P.Bergeron), 17:44 (pp). Penalties—Hamilton, Bos (holding stick), 10:46; Mikkelson, TB, double minor (high-sticking), 14:21. Shots on Goal—Tampa Bay 5-8-9—22. Boston 7-9-11—27. Power-play opportunities—Tampa Bay 2 of 8; Boston 2 of 5. Goalies—Tampa Bay, Garon 2-7-0 (27 shots-24 saves). Boston, Khudobin 3-1-0 (22-20). A—17,565 (17,565). T—2:29. Referees—Eric Furlatt, Ghislain Hebert. Linesmen—Greg Devorski, Matt MacPherson.