Pittsburgh Penguins' Tanner Glass (15) checks New York Rangers' Ryan Callahan (24) into the boards during the first period of an NHL hockey game in Pittsburgh, Friday, Feb. 7, 2014. (AP Photo/Gene J. Puskar)

Pittsburgh Penguins' Tanner Glass (15) checks New York Rangers' Ryan Callahan (24) into the boards during the first period of an NHL hockey game in Pittsburgh, Friday, Feb. 7, 2014. (AP Photo/Gene J. Puskar)