Anthony Mantha didn’t have the chance to play in Montreal this season because of a shoulder injury that kept him out of the Washington Capitals lineup for four months. The Longueuil, Que. native made it count on Saturday night with two goals in 34 seconds and two assists as the Capitals crushed the Canadiens 8-4 at the Bell Centre. “It’s really good (for confidence), especially in games like these in Montreal,” Mantha said. “My family and friends are here, I can’t wait to see them. I’ll try to continue on that run and build up as much confidence for the playoffs.” Capitals coach Peter Laviolette said injuries like Mantha’s have periods of rehab where “there’s no light at the end of the tunnel.” The veteran coach was glad to see the 27-year-old perform ahead of his team’s regular-season home stretch. “It’s really good having him back because of his size, because of the way you can be physical, his skill level and the way he can contribute to our team when he’s on his game,” he sai...