User blog comment:B214/Chapter 383 Surfing Lucy thoughts and analysis/@comment-24467372-20140509122703/@comment-7418318-20140509135353

No not his fists. He has fins growing out of his forearms. Those have already been shown in his first appearance in the group-shot of the Nine Demon Gate's introduction, so I'm absolutely sure they are no curse, but simply something that grows out of his body. Just like Sayla has horns growing out of her head and Jackal has a tail, Torafusa has fins. And apparently those fins are solid enough to hurt when you are hit with them... maybe even sharpened.