"and sells him": and not half of him. "and he is found": "finding" is only with witnesses. "in his hand": "in his hand" always connotes "his domain." And though there is no proof for this, it is intimated in (Numbers 21:26) "And he took all his land from his hand", and (Genesis 24:10) "And the servant took ten camels … and all the good of his master in his hand," — whence we infer that "in his hand" always connotes "his domain."
The Torah on About a Kidnapper and Sells Him
Mekhilta Tractate Nezikin 5:16