What Zen Is This Koan?

Reading in a book, I came across the following Zen koan:

Whenever Gutei Osho was asked about Zen, he simply raised a finger. Once a visitor asked Gutei’s boy attendant, “What does your master teach?” The boy too raised his finger. Hearing of this, Gutei cut off the boy’s finger with a knife. The boy, screaming with pain, began to run away. Gutei called to him, and when he turned around, Gutei raised his finger. The boy suddenly became enlightened.

Do you get it? I don’t know if I get it. How does the boy become enlightened? What does the visitor make of it all? What does the master do with the finger?

Zen koans are famous for simultaneously suggesting and resisting meaning. This one however I cracked. Through a process of ‘inductive leapfrog-thinking’ I realised there had been an error in the translation. The translator had consistently rendered “raised a finger” for what in the original Japanese had in fact been “gave the finger”. Thus the true koan reads:

Whenever Gutei Osho was asked about Zen, he simply gave people the finger. Once a visitor asked Gutei’s boy attendant, “What does your master teach?” The boy gave him the finger. Hearing of this, Gutei cut off the boy’s finger with a knife. The boy, screaming with pain, began to run away. Gutei called to him, and when he turned around, Gutei gave him the finger. The boy suddenly became enlightened.

Makes much better sense. Still, not very Zen.