The Bruins scored their third goal of Thursday night’s game in the closing minutes of the second period on a scramble by the second line with each of the three forwards crashing the net and attacking the puck.It was very unclear after the puck popped up in the air and bounced off a Winnipeg defender’s glove as to which player actually scored the goal. It was eventually credited to Viktor Arvidsson, but Arvidsson, Pavel Zacha and Casey Mittelstadt all stood there in comic bewilderment not sure as to which player should lead the fist bump honors as the goal scorer.“Yeah, it took a long time for us to figure it out…we still haven’t figured it out,” said a smiling Arvidsson. “It’s fine. It went in and that’s the most important thing.”The three forwards had a good laugh about it after the game while helping power the Bruins to a 6-1 thrashing of the Winnipeg Jets at TD Garden on Thursday night. The victory keeps the Bruins implanted in the No. 1 wild card playoff spot, but it is going to be a wild finish with three playoff spots essentially for four teams in Boston, Detroit, Columbus and the New York Islanders that have just a single point separating them in the Eastern Conference standings.