According to "Gukansho," 'After Yoshitsune visited Kamakura in Kanto region and returned to Kyoto, an evil intention came out,' and Yoshitsune gradually deviated from regulation by Kamakura.
『愚管抄』には「関東ガ鎌倉ノタチヘクダリテ、又カヘリ上リナドシテ後、アシキ心出キニケリ」とあり、義経はしだいに鎌倉の統制から外れていく。