Yeah, that diagram can be misleading for how the skier gets the wedge to happen at the start of the new turn.
It i
mplies that the skier rotates the new outside ski into a wedge ("start the wedge" with its arrow and the two little wiggle lines next to the tail of that ski) while doing nothing in particular with the new inside ski. Better not do that in a LII exam.
@Magi, your description of how to get the new outside ski to diverge at initiation is an interesting one. I think you are saying to tip it onto its big toe edge and maybe to "weight" it (perhaps by extending its leg to press the ski's edge downward onto the snow?). With extra pressure and extra edging, it will turn faster than the new inside ski and voila, you've got that wedge. Have I got that right? Or maybe you only mean extra edging does the trick.
If one weights the new outside ski by moving the body over it, that's also a fail in the exam. As magi points out, the body must move towards the new inside ski, not towards the new outside ski.
There are other ways to get the wedge to happen without visibly rotating it or moving the body over it and thus failing the exam. But this is thread drift, so I'm not going to elaborate.
All this is to say that the wedge christie is a "trick question" on the LII exam designed to separate the sheep from the goats. Instructors do have to go through training to get this move right, or at least to get it to not look wrong. The orthodox movement pattern as defined by PSIA is not intuitive to a good strong parallel skier.
As
@4ster points out, no one can expect a beginner skier to do it the way the instructors are supposed to do it for that exam, and no beginner following an instructor down the hill trying to do wedge christies will detect the nuances instructors are required to understand. It might be interesting in another thread to discuss what mission such exam tasks serve.