Turning Swallow

Concealed Sword: Swallow Return or Swallow Reversal, localized as Secret Technique: Turning Swallow Strike) is the fabled technique of the legendary swordsman Sasaki Kojirou, who was said to be able to cut down a swallow in mid-flight. He achieved a Mystery attained only with human techniques that rivaled the Noble Phantasms of Servants.

It is not something recognized as a Noble Phantasm under the Fuyuki Servant system, but rather an intrinsic skill of the anonymous swordsman representing the legend of Kojirou. While still unranked, it is classified as a Noble Phantasm under the Grand Order system.

This demonic sword technique, the utmost and sole technique used by Assassin, is not a Noble Phantasm or a magical phenomenon, but it has reached a level comparable to one out of pure godlike skill that "surpasses even Servants." It is a technique where three concurrent arching blades close on the enemy from all sides to create a prison, allowing no chance for defense or evasion.

While he downplays it as simply successive slashes, it is actually bending the laws of physics to multiply its existence.

It starts with a flash from this world, followed by two absolutely simultaneous, over-lapping flashes that disregard the concept of time and space, producing a slash attack that arrives from three different directions by momentarily using the Multi-Dimensional Refraction Phenomenon of Zelretch's Second Magic to transcend speed, dexterity, feints, and many other elements.

It is an extremely important technique to Assassin, who never takes up a stance, which can be seen by observing how he lifts his sword and swiftly launches the technique.

사사키 코지로의 검법인 츠바메 가에시의 완성.

날아오는 제비를 검으로 쓰러뜨리는 것으로 이것은 스승이 말하기를, " 너가 날아오는 제비를 칼로 벨 수 있다면 너의 검술은 완성된 것이다."