In reality, Z, the defender only has to have her foot off the line if there's contact. It's not as though it can never touch the line at all. The dribbler has to be much more careful about where the line is. The defender can be a foot or 18 inches away from the line and still be effectively blocking the dribbler from moving down the line. A good feel for where the line is should be enough. The dribbler needs much more exact feel than that.
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