Apparantly they have a whole bunch of extra guards, and is an extremely unpredictable, fast paced style. Though it seems all of this extra movement comes from the fact that when a swordsman says the Italian names of the gaurds and cuts, their arms and hands involuntarily begin to move at a high velocity, leading to a sudden change of guard or strike.
Teaching the art is very difficult, as when this happens to the instructor, and they try to explain the name of the gaurd or cut they have just involuntarily used, their arms start moving again, and this can continue in a vicious unbreakable cycle for hours until the teacher passes out from exhaustion.