You received news that XYS is well and alive and is passing by Yanmen Gate again, this time, coming for your son's well-being (since he believe you to be dead).
The Hans were fiercely at war with the Khitans at the moment and you decide to spin a tale saying that XYS was a Khitan spy sent to assassinate key figures...
Your plan is the exact same one...to assemble a team to ambush him at Yanmen Gate.
You get to assemble a team of, say, 6 to ambush him. Who do you pick? You can find back the same people to finish the job that wasn't done many years ago...but that would risk exposing the fact that you are alive.
What do you do? Who do you find?