Plate

Both fencers inside in Third; enemy's withdrawn guard relies on left hand near face; striker disengages around the fingers and wounds in Fourth as enemy turns to Second
Both fencers inside in Third; enemy's withdrawn guard relies on left hand near face; striker disengages around the fingers and wounds in Fourth as enemy turns to Second De lo Schermo, overo Scienza d'Arme · Copenhagen, 1606 · Plate 48

Translation

Here is yet the last wound in Fourth against a Second, which likewise wished to parry with the left hand, but the result was the contrary. For, both being on the inside, the one who wished to parry with the hand had withdrawn his guard so much that the strong could not defend him, trusting only in the defense of that hand, which was too high for the face. The striker made a feint that he wished to wound in the angle of the right flank, and the other, turning the body to remove that part, carried the hand to the defense, turning into the guard of Second in order to wound the enemy in the chest. The striker, seeing him make such an action, disengaged the sword by the side of the fingers of the enemy hand, and wounded him in the chest with Fourth in the time that he was carrying himself forward; and by turning the body out of presence, the striker saved himself also with the hilt of the sword, so that the enemy blade passed vainly, although the angle of the Second bent toward the part to which he was turning his body.

Analysis

Initial guards Both in Third on the inside.
Wound Thrust in Fourth to the chest.
  1. The enemy has withdrawn the guard so far that the forte cannot defend him.
  2. He relies only on the left hand, held too high near the face.
  3. You feint toward the angle of the right flank.
  4. He turns the body to withdraw that target.
  5. He carries the hand to the defence and changes into seconda to strike the chest.
  6. Seeing that, you disengage around the line of the fingers of his left hand (per la parte delle dita della mano aversa).
  7. You hit him in the chest in quarta in the tempo of his advance.
  8. Turning the body fuori di presenza, you also save yourself with the hilt.
  9. His point passes vainly, even though his seconda angled toward the line of your turn.

Translation note

Johnson says the adversary "meant to parry with the left hand but has failed." The fuller point is: his guard was so withdrawn that only the left hand could defend, and that defect made the action fail.
The Steel Marginalia · HEMA Study Group Notes in the margins. Truth in the bind.