when xia tian, xia mei and xia yu found out that their powers were suppressed by a demonized power-user (魔化異能行者), they tried to expose him in front of their mother. their attempt succeeded, but then he attacked them with his spell to control others. the family was in great trouble and almost killed each other until xiu cast his controlling spell on him and turned the fight around, but vincent managed to escape xiu's grip. his master was spared by his life, but he was tortured as punishment for his failure. he was not seen again since then.