This is how I finish a game when I'm feeling confident (at least a one stock lead). It's really easy but I just love doing it. Simply running up to an opponent, jumping before they can reach you, before you hit the ground, jump again so that you're now above them, if you do it right, anyone in their right mind would either have tried grabbing or tilting you. As you fall onto your lagging opponent, use your u-air, flicking them to their death =). If you only hit with the first kick and not the powerful second, you're not giving yourself enough air time. Go on practice mode and try it. If you do more than 10 damage, you've done it right. 3-5 and yeah, you'll be the one dying =P. Psy.