Sword Fighting for Armored Knights

From a 16th-century manual produced in Nuremberg, now in the Berlin State Library. It consists almost entirely of illustrations, with very little text. For men in full plate armor, the edges of the sword become almost irrelevant; they might as well be fighting with iron rods or wooden clubs. From BibliOdyssey. 

 Does anybody know what the ritual shown in the lower illustration above is about?