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A Bill wins scenario where Bill is keeping Ford. Ford is unaware that his family is still alive (in their own little bubbles naturally) , Bill interested in keeping as pawns to get what he wants from Ford.
When he eventually reveals this news to Ford, Ford of course wants to see them. Bill wants to make a deal.
Bill offers a visit session with his family if Ford gives him one small thing that he won't miss Bill is sure.
His hand.
Ford assumes of course Bill means his literal hand. It seems like Bill's sense of humor as far as Ford knows. So he agrees to he deal.
Thing is, Bill did not mean his literal hand. More like hand in a meld of a human and a creature like Bill, marriage.