Emiko just gave a look at Misaki, a look that a serial killer might have when she simply answered her question, "I did."
Aboard the transport, she would make an admission. "My father is in the medical field so I often got to sit in on procedures, everything from simple surgery to autopsies. I have a good memory so I remembered where everything is inside the body. He would say things during surgery like...." She looked up and to the side a little. "......Whoever did this knew exactly how to hurt them or "If you want someone to suffer, that's a good way to do it." She took a sip of some water and drew the sticks from hair and let it fall, holding the sticks up for the sisters to see, each having a slight point on them. She then took a finger and touched Misaki at a point on either side of her ribcage. "As you saw, burying my sticks in those points collapsed his lungs. He had no chance and was defenseless so getting his heart became easy."
She then put on an evil grin, "I'll have to teach you sometime, Misaki-san."