If yes how to do it? Our caller explined us that we should make two waves center heads are leaders and ends heads are trailers and then do cast a shadow. For me it is a bit strange. Does it exist?
Cast A Shadow can be done from a Promenade by designating who the Leaders are. "Heads Lead Cast A Shadow" is equivalent to adjusting to Parallel Lines with the Heads As Leaders then doing a Cast A Shadow.
The example above, with Heads in one wave and sides in another, doesn't work because All Heads would have to be Leaders, which isn't possible.
If, however, it were the case that the Heads were on the End in one wave, and in the Center in the other, it would work.