Buffalo will be Roberson's fourth program in his seventh year of college football.
The Nittany Lions couldn't muster much offense in a sweep by Lewis.
Dylan Lugris delivered the game-winning goal in round four of the shootout over the No. 1 team in the nation.
Walfe, who has four years of eligibility remaining, transferred from Michigan.
Captain Tessa Janecke tied the all-time points leader with an assist to Abby Stonehouse.
The junior announced on Saturday he would return for his senior year.
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