Never seen this before

[kick01]

I was at a wedding last weekend and had the privilege of being in the wedding party. The photographer that was taking the pictures of the wedding party kept doing something and I was wondering if you could all explain what it was and why she was doing this.

She was shooting with a Cannon 5D and when taking shots she would taken them in a in a box motion. Top high left, top high centre, top high right, then on to centre left, centre, centre right, then down to the bottom left, bottom centre, bottom right. Each time placing the subject in a different part of the frame. Was this for composition purposes - the best shot wins, or was it due to lighting?

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Digitally Enhanced Photography