After seeing how events unfolded in the third period of Wednesday night’s game in Montreal, Bruins coach Claude Julien admitted he has some thinking to do.

Specifically, Julien has a decision to make before tomorrow afternoon’s Garden visit by the Tampa Bay Lightning on whether to keep his first two lines as they were in the final 20 minutes in Montreal, or revert to the season-long setup.

The Bruins had gotten little done offensively in the first two periods against the Habs, trailing 1-0, so Julien swapped his top right wingers. Tyler Seguin moved up with David Krejci and Milan Lucic; Nathan Horton dropped back with Patrice Bergeron and Gregory Campbell.

The result: A 2-1 B’s win, as Seguin scored one goal and set up Krejci for the other. The re-shaped No. 2 line also had its best period of the game.

So, does Julien stick with what worked so well at the Bell Centre, or go back to the Lucic-Krejci-Horton trio that’s been the team’s best this season?

“That’s a good question,” said Julien after 10 Bruins had a brief skate yesterday at Ristuccia Arena. “It’s something I have to think about a little longer for sure. Do I try it a little longer or do I go back to our regular lines? It’s good I’ve got a couple of days to think it over. Hopefully the decision will be the right one.”

The importance of the game against the B’s archrival — and, indeed, the importance of every point in the standings during the lockout-shortened season — led Julien to make the shake-up during the second intermission Wednesday.