St. Louis Blues' Kevin Shattenkirk, left, and Boston Bruins' Brad Marchand chase after a loose puck during the second period of an NHL hockey game Thursday, Feb. 6, 2014, in St. Louis. (AP Photo/Jeff Roberson)

St. Louis Blues' Kevin Shattenkirk, left, and Boston Bruins' Brad Marchand chase after a loose puck during the second period of an NHL hockey game Thursday, Feb. 6, 2014, in St. Louis. (AP Photo/Jeff Roberson)