Indeed, after Clara confessed to the Ice Phoenix Mistress that she would still save her brother no matter what, even after knowing the significance, the Ice Phoenix Mistress forbade her from entering the inheritance site again.
Unlike the Dragons, the Phoenixes viewed dual cultivation as a sacred act and would only do it with one partner in their lives normally. It could be said to be ingrained in their blood. Therefore, the Ice Phoenix Mistress was disappointed with Clara's answer, perceiving that she was merely doing it for duty or out of familial love.
She could only see familial love and the trepidation of losing her brother in Clara's eyes, so how could she let Clara walk the path of burden?
Moreover, this technique wasn't permitted to be used on others but only their significant other, so it was all the more vexing for the Ice Phoenix Mistress to hear that Clara wanted to help her brother despite the significance of the matter.
