The Rice player rolled directly into his knees, and I'm fairly sure the same guy did the same thing to Irby right before half. It was the play before the field goal. I thought Irby was hurt on that play because it looked like a very similar tackle and Irby got up slowly. I don't know if it was "cheap" but I don't like to see a player just lower their shoulder (no wrapping up) and roll into a taller guys knees.