Smoothness is the essence of a fast light air sailor. He/she moves the rudder as little as possible, and re-trims the sails with equal smoothness. None of this ripping on the sheets at the bottom mark with the helm hard down. This will not only stop the boat, but also completely disrupt all the airflow over the sails. The net result is a boat literally stalled on the exit from the bottom mark, jammed up into the wind and sliding sideways rapidly, as there is no attached airflow on the sails to drive forward, and no forward motion of the boat to generate lift.