Mason left Friday's practice with what could be a significant injury, Frank Seravalli of the Philadelphia Daily News reports. The goalie was unable to leave the ice under his own power and required assistance to the locker room. Details remain scarce regarding his condition, but it looked to be a non-contact injury, as Mason fell to the ice after his body seemed to inexplicably lock up. The Flyers' training staff will likely examine him extensively to see what kind of injury he's dealing with, so it might not be until Saturday that the nature of the ailment is revealed. Even if Mason's issue proves to be more minor than anticipated, Ray Emery still looks like the favorite to start Saturday's game against the Maple Leafs, and quite possibly, many more contests to come.