Very rare & very good obsessio

This is an action launched from prima custodia or priest's special longpoint, against the opponent in quinta custodia. Because quinta custodia in I.33 is shown to be a position that launches a lot of in-tempo counterattacks, this obsessio is designed to defeat it. The aim is to hit the opponent's shield by the shield of my own, while keeping my word hand retracted and so still prepared to handle the counterattack of the opponent. There are few possible outcomes of that.

• The opponent doesn't react, possibly because he didn't intend to launch in-tempo counterattack. If so, then I have successfully besieged him, and I can continue with a thrust under our connected shields.
• The opponent mistakes shield strike for the real attack and launches his in-tempo halpschilt at my head. In this case I will react with falling under the sword and shield.
• The opponent mistakes shield strike for the real attack and launches his in-tempo thrust below our connected shield hands. In this case I will thrust against him, meeting his thrust on the way and leading it away. This employs the same mechanism as "exchange of thrusts" from Fiore's longsword.

This siege is introduced in play 37