>>718798251
That is from the Berlin Picture Book, a book of illustrations, not a true fencing manual, and its focus is on accurately depicting the fighters rather than on explicating their techniques. The artist Albrecht Dürer just observed people training and drew those while making notes. And basically yes, that technique is used when your opponent over commits on a strike. You rush in sliding the sword inside his guard, use your weight to pressure him back, and then grab the blade to create leverage to throw, trip, or dislocate. You are familiar with MMA think of it as a modified standing Kimura Lock only using the sword as the lever instead of your own wrist.
https://wiktenauer.com/wiki/Berlin_Picture_Book_(Libr.Pict.A.83)