Well, lets take a look, especially since it is directly on point (well directly in a tangential sort of way
)
This is
exactly what is meant by the phrase "taking the space". The alleged offence by McCaw is that although he was entitled to play the ball from the angle he comes from, instead of playing the ball he gets in the way of the halfback. It is a bugbear of the people at SAReferees. Personally I think its a bit of a stretch in most cases where the phrase is used.
Sticking to this example its a crock because he does begin to bend down to pick up the ball and is cleared out legally by a South African player. The law was working exactly as it was supposed to, but for some reason Rolland found a penalty. It is perfectly clear that no ruck had formed and that McCaw was entitled to go for the ball. He's not entitled to play the halfback but is that really what he has done (or does he have an obligation to get out of the way of the halfback whilst going for the ball).