Benoit Pouliot learned this all too well when he had a glorious chance on a power-play rush. Pouliot reached out to snag the pass in time to look up and try to pick a spot on Mason. He chose the glove side.
Mason stopped it cold, and with some flare, too.
The game at that point was already 2-0 Flyers so it wasn't exactly a moment that swung the game but it lifted an already excited building that nearly blew its roof off when the penalty concluded less than a minute later and Erik Gustafsson was scoring on a breakaway right out of the penalty box.
I think we can safely say the Flyers missed Mason in the first few games of this series because since he's returned he's been very good in the Philly net.