I logged out to check the feature and saw that he was quoting my postings. I now have unblocked since the feature does not work properly as he can obviously log out, then login in as a different nick and then copy my posting and paste it back from his clipboard once he logs back in as the blocked poster.
But if you log out, you're going to see him quoting your posts. The only way he can quote your posts at all is if he comes to a thread where you are the last poster and hits "reply" to see it. The board then prints your reply in his text box and he can type to it.