If there is an odd number of fields between the trees, the Kara which is not standing in the center notices that his counterpart is:


In the above picture the red Kara therefore has to "tell" the yellow one to lay down a cloverleaf. He can do this by laying down a cloverleaf and taking a step back. The yellow Kara will then see this cloverleaf, lay down one of his own, take a step forward and pick up the cloverleaf the red Kara has layed down.