Thanks for bringing this to our attention. As we work through the subdomains for clean-up, we catch a lot of things that were missed, but clean-up is a project that is going to take quite some time.
Now, looking at both these stories, the original author was hoping people would MST his work, or do their own versions. It's a theme he's repeated in other stories as well, so I'm not seeing this as an issue since the second author was clear as to his source as well. It's unusual, but appears to have the original author's consent and permission. Unless my admins differ, I'd let this one stand as is.