After the Bruins took a two goal lead in the first, the Flyers showed a little bit of their own firepower, burying three goals of their own in the second period--a natural hat trick from forward Scott Hartnell.
Each team has a power play goal now, and Hartnell's first gave the Flyers some momentum for the rest of the period. His second came just four minutes after his first and his third that gave him the natural hat trick came with 47 seconds left to go in the period.
That is Hartnell's sixth career hat trick, and it gave the Flyers the lead after forty minutes.
The Bruins are 4-8-1 when they trail after the second period, but have a +37 goal differential in the third period so far this season.