North Dakota and Nebraska-Omaha players warm for a college hockey game held outdoors in Omaha, Neb., Saturday, Feb. 9, 2013. The rink sits between what would be first and third bases at TD Ameritrade Park, the stadium where the College World Series is played each June. (AP Photo/Nati Harnik)

North Dakota players walk to the rink before the second period as they play Nebraska-Omaha in an NCAA college hockey game at TD Ameritrade Park in Omaha, Neb., Saturday, Feb. 9, 2013. (AP Photo/Nati Harnik)

North Dakota plays against Nebraska-Omaha in an NCAA college hockey game at TD Ameritrade Park in Omaha, Neb., Saturday, Feb. 9, 2013. (AP Photo/Nati Harnik)

North Dakota's Danny Kristo, left, skates past Nebraska-Omaha's Michael Young in the first period of an NCAA college hockey game held outdoors in Omaha, Neb., Saturday, Feb. 9, 2013. The rink sits between what would be first and third bases at TD Ameritrade Park, the baseball stadium where the College World Series is played each June.(AP Photo/Nati Harnik)

North Dakota's Nick Mattson, right, scores against Nebraska-Omaha goalie John Faulkner in the first period of an NCAA college hockey game held outdoors in Omaha, Neb., Saturday, Feb. 9, 2013. The rink sits between what would be first and third bases at TD Ameritrade Park, the baseball stadium where the College World Series is played each June.(AP Photo/Nati Harnik)