The Shimazu clan felt so doubtful about Shoan's prompt communication that it isolated Shoan in the Amatsura castle and his family in the Hoshikawa castle.
ところが、急に内応してきた紹安を島津家は疑い、本人は天連城（あまつらじょう）にその家族は星河城（ほしかわじょう）へと隔てた。