According to "Azumakagami" (The Mirror of the East), this happened because Tomomasa reached out to his wife's mother Maki no kata (Lady Maki), Tokimasa HOJO's wife, about the conflict with Shigeyasu, and Maki no kata gave her husband Tokimasa a slanderous information against Shigeyasu.
『吾妻鏡』は朝雅が重保との争いを妻の母牧の方に訴え、牧の方が夫の北条時政に畠山親子に謀反の疑いがあると讒言したためとしている。