[Admittedly, she's going out on a bit of a limb here. She doesn't know the situation aside from piecing together what she saw and taking Zelgadis's word as truth. It can't hurt, which is why Yomi continues.]
When I was fourteen, one of the Exorcist masters who trained me passed away suddenly. I looked up to her a lot - she possessed Byakuei, the most powerful of the sacred beasts. [Which will one day be Kagura's, she thinks, a small twinge in her stomach.] I was still in training at the time and wasn't allowed to go out by myself, but we had gone out together on an assignment when she was struck down.
[It's a bit of a sour memory, but her tone doesn't lose any softness.]