Removes Thumb

"The handcuffs that once bound her now hangs uselessly from her right arm like an overlarge accessory. There is no damage to the handcuffs themselves, nor a chink in the chain, or some breakage in its ring. The same cannot be said, however, of Shiki’s left hand, from which fresh blood emerges red and whole. For it appears that in order to free her hands from the cuffs, she has had to gnaw through the base of her left thumb."

Kara no Kyoukai 7: Murder Speculation (Part 2) Chapter 7 - page 206