Arnold-Pommel received their first 10 of the season but lost the dance-off to fall to the bottom three.
Nedoroscik and Arnold dropped to sixth place after receiving all eights in the individual and group dance.
The Nittany Lions seemed to find an equalizer in the 88th minute before a last-second free kick goal from the Trojans.
The Penn State gymnast dedicated his performance to men's gymnastics, dancing to "Seven Nation Army."
Mieke Schiemann, Kaitlyn MacBean, and Ginger Fontenot all ranked in the top 100.
The Nittany Lions have been ranked No. 12 for four straight weeks.