Allen had two rushing touchdowns, which powered the Nittany Lions to a 27-6 victory over the Scarlet Knights.
"He gave everyone in that room a chance and an opportunity."
"Nobody flinched, and I think it shows how tough this group is, mentally and physically."
After quarterback Drew Allar left the game with an injury, Beau Pribula stepped up for the Nittany Lions.
Wallace is battling his second injury of the season.
Erica Dambach clinched her seventh consecutive NCAA Tournament Sweet Sixteen berth, which is tied for the longest active streak in Division I women's soccer.