| Hmmm... interesting question.
I guess it depends on the move. I think it would be hard to do any Pretzel or a Springer/Nigel's Move (or whatever CEROC calls it!) without a signal of the hand behind the back.
Otherwise, I'd tend to agree that you could get away without signals, but it does make following easier. Of course, the problem with signals is when you unwittingly use the wrong one (e.g., the examples posted on here, where a lady has launched herself into a drop having misread a signal). |