Striving to develop his disciples at Omosu-dansho, in the fall of 1299 Nikko excommunicated Nichizon who was distracted by the leaves falling from pear trees outside the window during a lecture.
日興は重須談所で弟子の育成に努めたが、1299年（正安元年）秋、講義の最中に窓の外を舞い落ちる梨の葉に気をとられた日尊を破門にした。