You only need to put a small plank (best word I could think of) on the fence so that the actor can put his heel and weight on it yet it would appear as there is nothing there. The true trick is securing the plank.
If we're not having fun, then why are we doing it?
These are DISCUSSION boards, not mutual admiration boards. Discussion only occurs when we are willing to hear what others are thinking, regardless of whether it is alignment to our own thoughts.