The Flyers showed some life in the second period, outscoring the Bruins, 2-1, but it’s the home ice team that still leads, 3-2, after 40 minutes.
Ryan Parent blasted a slap shot through a heavy screen to make it, 2-1, Bruins at 7:38 of the period.
Boston came right back though and scored on the power play when Braydon Coburn blocked a shot from Johnny Boychuk  from the right point. The carom came out to Miroslav Satan at the top of the right circle. His shot beat Brian Boucher  to re-establish the two-goal advantage at 11:43.
But the Flyers responded with the first power play goal against the Bruins in these playoffs after 21 consecutive kills as Chris Pronger  scored his third of the playoffs on a blast from the right point at 15:48.
The Flyers outshot the Bruins, 11-6, in the second.
It’s the first time the Flyers have trailed after two periods in six playoff games this year.