sorry to derail the thread :-)
it can have circle walking how ever many steps you would like then to any posture and step if you want to and then do any posture.
in general the way i do it is i start by doing the form with no circle walking just doing the postures. then i circle walk and do random postures. you can have a training partner call out the next random posture to test you brain a bit.
since you mention different surfaces i feel it is essential to walk you circle on a variety of surfaces uneven ground, flat ground, hills, rocks, on ice (as seen in that clip), in mud, in thick grass ... etc etc