t.j. mcdonald. >> matt: that's tough. i've got to tell you right there. >> joe: in the midst of it all. >> matt: that's a tough one right there. mcdonald is already committed to the run and he's coming full bore when matt scott hits that knee, he's already in the act of -- you see that, he's already in the act of going. >> joe: obviously player safety is such a point of emphasis. you know he actually took a hit to the head by dion bailey. >> referee: after the play, personal foul, number 7 on the defense. half the distance to the goal. automatic first down. >> joe: and the penalties mount for usc. >> matt: matt scott is throwing up. that's not a good sign. get him out of the game. >> joe: any neurologist will tell you that is one of the symptoms of a concussion is vomiting in reaction to being hit in the head. he's walking it off right now. down around the 14 yard line. it is set up as a first and goal as b.j. denker, backup quarterback, has the head sets on. and we're going to get a time-out here. >> referee: time-out ar