'I guess I should use this one... no entirely sure how mine would react...' She thought as she looked at the knife. Resting her hand on the tabletop, she used it to steady herself and after a long pause of finally contemplating the course of her actions, made a slow cut into her arm enough to make it start bleeding. The cut was a bit deeper than she should have made, but it didn't seem life threatening, having tying a knot on her arm to limit what would come out anyways. "Ow..." She whimpered a little, biting her lip.
In terms of scent of the blood however was already pretty significant. Sophia was already pretty fit and healthy, maybe it was also being Seras was starving, but this blood smelled extra special.
"How much do you need to get to last until the others get back?" Sophia asked her, still biting her lip, not exactly wanting to look at the bowl of her own blood.