The drive might have clipped Islanders forward Brad Boyes on its way past goalie Evgeni Nabokov.
Brad Boyes scored the lone goal for New York, which had a five-game point streak snapped.
Brad Boyes fed a cross-zone pass to Moulson, who was alone near the right post.
Brad Boyes, with a goal and two assists, Matt Moulson and Frans Nielsen also scored for New York.
"Our approach going into the series was to put a lot of pucks on net, " Islanders forward Brad Boyes said.
Tavares slammed in his own rebound in front after Brad Boyes fed him following a turnover by Penguins star Evgeni Malkin.
Brad Boyes added an empty-net goal in the final minute of play.
Pittsburgh's third line of Morrow, Brandon Sutter and Matt Cooke shut down New York's top line of Tavares, Matt Moulson and Brad Boyes.
The Bruins' poor power play finally produced when Seguin scored his 14th goal at 3:41 of the second period after Brad Boyes was penalized for delay of game.
Martin scored at 12:10 of the second, knocking in a pass from Brad Boyes for his second of the season with Montreal's Lars Eller serving a tripping penalty.
"Killing that (5-on-3) penalty when we were down 3-1 late in the first period, you could look at that as a turning point for us, " said Islanders forward Brad Boyes, who had a goal against his former team.
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