How did he get the piece of porcelien into his hand?
When John was tied to the chair he picked up a piece of broken porcelien from he table with his mouth, then he dropped it near his crotch. Afterwards he did some jerky motions and the piece miraculously appeared in his hand...
Wtf was that? There is no way that piece of porcelien could have have been transferred from near his crotch to his tied up hands. Note that the chair had a full back.