We shouldn't confuse new callers by failing to point out that there
are other contras that use a different shadow. The shadow Brian
speaks of is similar to the corner in a square. The other shadow
could be compared to a right-hand lady (left-hand gent) in a square.
Just by looking at the positioning and timing in the B2 it would make
sense for the shadow to be of the 'corner' variety.
If it was a r-h lady (left-hand gent) shadow the instructions would
probably say allemande left partner once around. In this dance using
a 'corner' shadow would ensure a longer partner swing.
When you're not sure, it's always a good idea to diagram the
choreography.
Great dance!
T