The Bruins’ second line was anything but secondary in the regular season. But during this Eastern Conference quarterfinal series with Toronto, the trio of Brad Marchand, Patrice Bergeron and Tyler Seguin has struggled.

All the while, the team’s first line of David Krejci, Nathan Horton and Milan Lucic has carried the load.

As Marchand has watched the dynamic play from his teammates, he feels a range of different emotions. On one hand, he’s happy. His teammates are having success and the Bruins went into last night’s Game 5 up 3-1 on the Maple Leafs. On the other hand, the left winger is motivated.Marchand knows what his line is capable of, and knows that once they start to click again, the better off the Bruins will be.

“We want everyone to be able to chip in and contribute,” Marchand said. “We don’t want those three to feel like they have all the pressure on them to score the goals. I mean, if they want to keep doing it, that’s great, but we need everyone else to step up.”

The Bruins have tallied 41 points (15 goals and 26 assists) in four playoff games. Krejci, Horton and Lucic have combined to notch 22 of those points (eight goals and 14 assists), which is 54 percent of the team’s scoring. Krejci leads the entire league in playoff points (10) and goals (five).

Marchand, Bergeron and Seguin have collectively struggled to get on the stat sheet. The three combined have three points. Bergeron’s goal in Wednesday’s Game 4 was the line’s first of the series.