This is the third penalty shot goal of the season for the Boston Bruins. While I am sure that Pittsburgh Penguins fans will disagree with the call. Defenseman Derrick Pouliot's stick penalty prevented a scoring chance by David Pastrnak. Reading the NHL's penalty shot rule, I believe this is the right call.
53.6 Penalty Shot - If a player on a breakaway in the neutral or attacking zone is
interfered with by a stick or any other object or piece of equipment that
is thrown by any member of the defending team, including the Coach
or any non-playing Club person, a penalty shot shall be awarded to
the non-offending team. See also Rule 57.3 – Tripping for fouls from
behind to a player on a breakaway. (Cont)
57.3 Penalty Shot - When a player, in the neutral or attacking zone, in
control of the puck (or who could have obtained possession and
control of the puck) and having no other opponent to pass than the
goalkeeper, is tripped or otherwise fouled from behind, thus
preventing a reasonable scoring opportunity, a penalty shot shall be
awarded to the non-offending team. Nevertheless, the Referee shall
not stop play until the attacking team has lost possession of the puck
to the defending team. (NHL Rule Book)
With Pastrnak's goal, this marks the first time in #NHLBruins history the team has tallied 3 penalty shot goals in one season.