USC Trojans defensive tackle Leonard Williams was ejected from Saturday's game after throwing a punch at a Colorado player who spit on him. After reviewing tape from the incident, the Pac-12 has decided not to suspend Williams for next week's game against the Arizona Wildcats.

Before learning of the ruling, USC head coach Lane Kiffin did not say much about the incident at Tuesday's practice. According to him, he believed it was a confidential matter.

Even though the conference did not suspend Williams, Kiffin still could. Some believe he needs to discipline the freshman for his outburst, while others think he served his punishment by missing the rest of Colorado's game.

Regardless if whether Williams plays Saturday afternoon, the Trojans' defense is going to need to step up. The Wildcats are averaging nearly 40 points per game this season, and they just hung 52 on Washington last weekend. It will be the defense's first true test of the season.