Problem is, having already slowed the other team down by committing a foul, the offending team linger within the 10 yard distance stopping or discouraging the team awarded the free kick from getting any advantage without incurring a risk of loosing possession. Additionally the first sentence literally states that the kick should be retaken if an opponent is closer to the ball than the required distance. They either need to remove one of the sentences or tidy up their wording.