Steve Mason won't play on Wednesday after a shot from Colton Gillies hit him in the mask during the morning skate. He will be evaluated by the medical staff to determine the extent of his injury, but the Jackets have just six games remaining on their 2011-12 regular-season schedule. In the meantime, Columbus signed former University of Michigan goaltender Shawn Hunwick to an amateur tryout agreement and he will serve as Allen York's understudy against Detroit on Wednesday night.