Once bitten by a snake, one fears the well rope for ten years. Jing Ke was indeed wondering why the Mohist School would suddenly send him the Yuchang sword, not to mention the Three Swords of Ultimate Bravery.
Although he was heading off to assassinate the King of Dayuezhi, no one else knew about this except himself and Yanyan, so it could not have been prepared specifically for this mission.
"Don't overthink it. The Three Swords of Ultimate Bravery are the closely guarded secret of the Mohist Leader. No one else is qualified to practice them except the Leader."
Chapter 344