This is a drill that originated early in my days of learning SCA fencing. Lord Edmund and Lord Ivan started me on it, and I perpetuate it. The objective is to use three standard Capo Ferro parries to deflect attacks, while using good footwork to move forward and backward.
As noted, the attacker makes a middle thrust, a low thrust, and a high thrust, advancing a step with each attack. The defender uses Capo Ferro parries four, two, and five (by our numbering system) to deflect the attacks while stepping back each time. The fencers reverse roles after each series.