The big one stepped up behind him and roughly wrapped an arm around the merchant's throat.
The large one stepped in behind him and wrapped his arm around the merchant's throat, slipping his hand into the merchant's pocket at the same time.
mnli hypothesis: The large one stepped in behind him and wrapped his arm around the merchant's throat, slipping his hand into the merchant's pocket at the same time. premise: The big one stepped up behind him and roughly wrapped an arm around the merchant's throat.