I don't think the Nestorevic injury was an undercut though, he was way inside and there's going to be feet close together there.
One thing a lot of point guards could learn from Steve Nash is that he hardly ever kills his dribble. He always keeps it alive even when he drives baseline, where most guards would leave their feet to force something, he just keeps the dribble going and breaks the defense down. If you are a point and you get a team defense to follow you around, you're going to open it up for somebody. Nash moves through a defense like a stick sifting sand.