Probably due to the quickness of the downward slash, and the small amount of dust coming up after it. I think the last slash of the combo should be the most powerful, and therefore, probably take the longest to execute / has the weightiest hit. And right now, it has no sense of weight. I understand that it's his hand, and not a 200-pound Great Sword, but still, there'd be a little anticipation for the last hit.