CINCINNATI — With two goals in the first period and five points from winger Troy Terry, the top-seeded Denver Pioneers did what they needed to do to defeat the No. 3 Penn State Nittany Lions on Sunday with a 6-3 victory at the U.S. Bank Arena. With the victory, the Pioneers earned a spot in the Frozen Four for the second straight season. Denver coach Jim Montgomery admitted that Penn State’s relentless attack was difficult…