David Pastrnak had a four-point night and Boston matched its output in the first two games of its western trip in the opening 8:08 against former Boston College goaltender Thatcher Demko.

The lights were on at Rogers Arena Saturday night, but watching the Vancouver Canucks play, you’d have thought they were like the rest of the Lower Mainland: totally without power. Playing against a team that had given up 13 goals in their last two games,

Pavel Zacha had a goal and two assists and Jeremy Swayman made 19 saves for the Bruins (16-13-3), who had lost their first two games of this five-game road trip by a combined score of 13-2. Boston improved to 8-4-0 since interim coach Joe Sacco replaced Jim Montgomery on Nov. 19.