He replaced the starting goalie for the last ten minutes, the score was 6-4, gets pulled for extra attacker and Iginla scores an EN goal. Then the 'Canes gets two goals, making the score 7-6 and the EN goal the winning goal. Murphy gets the L since he was the "goalie" for the gwg.
This is kinda hard to say so i'll do my best. I believe the score was 6-4 when he came into the game. They pulled him and Iggy got an empty netter. Then Carolina scored two more goals in the final minute in the game(the last goal with 5 seconds left). The empty net goal by Iggy was awarded to be the game winner. With those two goals in the final minute by carolina made him the goalie of decision I believe. Someone else might be able to tell you better and I might be wrong but thats my take lol. Sorry it might not be accurate, but I tried
Edit: Mirimon beat me to it but atleast what I said was correct!