Hekiganroku - Case 69: Nansen Draws a Circle

Nansen, Kisu and Mayoku set out together to pay their respects to the National
Teacher Chu. On their way Nansen drew a circle on the ground and said,
  "If you can say something, then let's go farther."
Kisu seated himself [1] in the circle. Mayoku made an informal bow. Nansen
said,
  "If it is so, then let's not go any farther."
Kisu said,
  "What is this all about?"

[1]: I.e., in Zazen posture.