I am following this discussion within WEUnited (although the OP linked ConfederationWE documents, the tests are the same) and the PTB are getting clarification from the rules committee. I am sure it will be made more clear going forward, given the number of different interpretations offered!
Reading through it without any other context, I probably would have ridden this as a normal dressage C-A serpentine, but on thinking about it more, particularly in the context of WE, which does, as sascha pointed out, get more demanding wrt figures at the lower levels, I would lean towards the below as the intended figure. That would be 6m half circle left (at this radius, the circle/corner debate seems moot), across to a 9.3m half circle right, across, 9.3m half circle left, across, 9.3m half circle right, across and 6m half circle left. This would seem to be preparatory for the double slalom obstacle seen in EOH trials.
WE is definitely easier with a short-coupled, handy horse!
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