From Ringeck: The text and the gloss about the doubling [Duplieren] and about the mutating [Mutieren]: how they break the four openings. If you wish to reckon yourself, Artfully break the four openings: Double above, Mutate right below. I say to you truthfully: No master defends themselves without danger. If you have understood this properly, He may hardly come to blows. Gloss. This is when you wish to reckon yourself upon another such that you wish to break the four openings with art: so conduct the doubling [Duplieren] to the upper openings against the strong of his sword, and the mutating [Mutieren] to the other opening. Thus I say to you truthfully that he cannot defend himself from that, and may neither come to strikes nor to thrusts. The doubling [Duplieren] Item. Note, when you cleave-in with the wrath-hew (or otherwise high), if he displaces you with strength, then in-the-moment shove your sword's pommel under your right arm with the left hand, and strike him through the maw, with crossed hands, upon the sword behind his sword's blade (between the sword and the man); or strike him with the play upon the head. From Pseudo-Peter von Danzig: Here mark how you shall drive the Doubling [Duplieren] to both sides: Mark, when he hews above to you from his right shoulder: then hew also from your right with him, likewise above strongly to the head. If he parries and remains Strong on the sword, then drive up Meanwhile with your arms, and thrust your sword’s pommel with your left hand under your right arm, and strike in with the long edge with crossed arms, behind his sword’s blade on his head. Another: Mark, if he hews you with the long edge in to your head from above his left shoulder, and you do likewise, if he then remains Strong on the sword again, then quickly drive up with your arms and strike in with the short edge, behind his sword’s blade on his head.