Actually it had nothing to do with celebrating or where he did it. If you go back on ESPN replays and watch the telecast from the skycam, the camera followed him along and as he was running across the field, he spiked the ball. Spiking the ball in college is ALWAYS going to get you a personal foul. You can't see it on the normal telecast because it didn't have the angle on him, but from the skycam, as soon as he spiked the ball as he was running, the flag flew right over to where he threw the ball down.