When the help defender leaves his man to stop a drive, somebody has to cover the man he left, and that second rotation is what separates a team defense from five individuals. This play runs a whole possession with two baseline drives: on each, the post defender leaves his man to stop the ball, the weak-side wing defender drops to take the post, and the kick-out goes to the wing he left, a skip pass he closes out on; between them the ball swings across the floor so the rotation happens from both sides. Why the second rotation: the first helper's man is on the block, and a pass to him is a layup; the second helper's man is on the far wing, and a pass to him is a long skip. The defense trades the layup for the skip. Where the advantage lies: a skip pass is the slowest pass on the floor, so the second helper gets back to his man on the catch most of the time, and the drive that caused all of it ended in a pick-up. Common youth mistakes: the second helper watching the drive instead of dropping, dropping too late (the dump-off is already caught), and both helpers going to the ball. The second rotation here comes from Randy Brown's help-the-helper session for the Jr. NBA and Coach's Clipboard's man-to-man breakdown drills on baseline penetration; look them up for the drill progressions.
