#30 started to come out of his stance a split second before the ball was snapped, but it doesn't appear that he crossed the line before it was snapped. If this interpretation is correct, then it was a perfectly timed attempt. You have to get lucky to time it just right. If you're off by a fraction of a second, you will be offsides, and that could be very costly. On the other hand, it's a risk worth taking because it would have saved the day for the Bucs if he had blocked it. The Rams got lucky on that play!