What does "Shooting the Elk of Elks" mean?

> 僧問藥山：「平田淺草，麈鹿成群。如何射得麈中麈？」山云：「看箭！」僧放身便倒。山云：「侍者拖出這死漢。」僧便走。山云：「弄泥團漢有什麼限？」 > > A monk asked Yakusan, “On an open plain with shallow grass, elk and deer form a herd. How does one shoot the Elk of Elks?” Yakusan said, “Watch the arrow!” The monk let himself fall. Yakusan said, “Attendants, please drag this dead fellow out.” The monk chose to walk away. Yakusan said, “Fellows who play with mud balls know no bounds.” Master Yakusan pretends to shoot an arrow. The monk in the story lets himself fall. Master Yakusan apparently was not happy with the monk’s response. What should the monk have done instead?