In my opinion the chapter was pretty lame... Kuma left without doing anything, and something that should have without a doubt killed Zoro didn't. It seems like Kuma almost knew he wouldn't die from it yet still agreed to the ridiculous deal AND to not outright kill Zoro but transfer Luffy's pain unto him. Just waaaaay to many things that enabled Zoro and the crew to get away safely (well maybe not safely, but away), and it's not like it isn't the first time we've seen Zoro brutally hurt.