In order to make sure that sexy Kim Chi doesn't end up getting away, she needed to be bound and gagged. But Kim is a bit of an escape artist due to her strength and her flexibility. So the way to ensure that she can't struggle, she is bound both with rope and with barbed wire. Every struggle, every twist, every flex will possibly cause the barbs to rip into Kim's flesh, causing her undue pain and suffering. What had she done that she needed to be kept captive. That's a story for another day...