Philadelphia Flyers goalie Steve Mason's face mask comes off after being struck by the puck during the first period of an NHL hockey game against and the Dallas Stars, Saturday, Dec. 10, 2016, in Philadelphia. (AP Photo/Tom Mihalek)
Dallas Stars' Tyler Seguin loses control of the puck near Philadelphia Flyers goalie Steve Mason during the first period of an NHL hockey game, Saturday, Dec. 10, 2016, in Philadelphia. The Flyers won 4-2. (AP Photo/Tom Mihalek)
Dallas Stars' Brett Ritchie, right, traps the stick of Philadelphia Flyers' Mark Streit, left, after losing control of the puck to Flyer's Jakub Voracek, rear, during the third period of an NHL hockey game, Saturday, Dec.