In case you haven't been paying attention to USC football (I know, of course you have, but humor me), the fullback position is cursed this year. First, starter Brandon Hancock went out for the season (and, probably, forever) with a blown knee. Then second stringer Ryan Powdrell went down with a gruesome ankle injury. Sports Illustrated likened it to the drummer position in "This Is Spinal Tap", and that was two days before third stringer Stanley Havili went down today with a broken fibula against Arizona.
So it may be fourth stringer Mike Brittingham next week, unless they convert someone from another position.