The unit, which is leading the nation in sacks, has surpassed Carroll’s early expectations.
USC almost gives up a 20-point fourth-quarter lead, but the defense stands firm in the final seconds of an extended goaline stance.
Trojans have a seven-year winning streak against the Irish, and few have been close.
The highly touted recruit chose to the Fighting Irish over the Trojans.
Kristofer O’Dowd is likely to return to to action, while Kevin Thomas may be out.