'Sister' had been Hit by Rui, because of her disobedience to Rui when she failed to do something

while she had been hit, she had fallen. But she stayed there as her 'brother' reprimanded her..

But before Rui left he had instructed her to Warn 'mother' of the demon-slayers on the Mountain. and so 'Sister' got up and rushed to where 'mother' was without complaint.

Despite how bad she wanted free. She knew she would die. she had seen the punishment with her own eyes after all