Use this drill to practice:
Position 4 cones in a square, roughly 12m a side. Inside the square, position a cone roughly 0.75m diagonally away from one outer cone. In the opposite corner, position another inner cone roughly 2.5m diagonally away from outer cone. In the other two corners, position cones roughly 1.5m diagonally away from outer cone. All these distances can be adjusted to increase or decrease the difficulty for the defender.