User blog comment:Akali95/Kuma's Nikyu Nikyu no mi/@comment-3181121-20120219122657/@comment-4605926-20120219145435

Dionit - I'm not quite sure that you are entirely correct, how do you know that Kuma only extracts the pain and not the injury itself? Kuma clearly stated that if Zoro was to receive all of Luffy's pain, he would surely die, and afterwards we saw him all covered in blood. If Kuma only extracts the pain then I don't see a reason why the person that receives it would be physically hurt.