I rarely (if ever) complain about BB fixes, but really? This looked so obvious, to the point of embarrassing, it looked so staged. Why they would do that? I don't know.
I don't think they told her where to stand though, that's too risky. What would she do if another HM stood in her place, barge them out of the way? Nah a white and gold mask was in each box.
I say this as someone who doesn't care whether Gemma stays or leaves.