[70times7]

If I read correctly, it was detached below the fingernail. That would mean it was at or near Amazing Johnson's first joint. That is a bit more than a torn chunk of skin (and very scary if she were not she)

[BykrBayb]

Below the the fingernail, not above. If it severed the finger at the first joint, that would be above the fingernail. Below the fingernail there is only skin, and not much of that.