Yeah, I believe that's normal. It appears that it only kills his responses within a thread. If he starts a thread his first post will display but any of his responses will just consist of a header with no text. At least that is what happened when I put him on ignore.
Salty, you also have to be "logged in" for it to work. If you are just breezing through reading posts and never post anything, thus "log in", you'll still see them.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .