YOU SAID:

and then I took an arrow to the duck sitting on my purple knee.

INTO JAPANESE

紫の膝の上に座ってカモに矢を取ったし。

BACK INTO ENGLISH

Sitting on a purple knees and took the arrow to duck.

INTO JAPANESE

紫に座って膝し、アヒルに矢印を取った。

BACK INTO ENGLISH

Sitting on a purple knees and took the arrow to duck.