That's what happens if a sect member try to leave the sect? I figured they'd just forget about the skills they learnt in the sect, not have their entire time at the sect wiped from their mind. I wonder, would the same thing happen to Qian Qian if she had not been provoked by MC into dragging him with her to the frozen pool? She did say she'd return in a decade or so, so perhaps that would still count her as a sect member.