Like k, now that you've reminded me that this specific person is on my ignore list, I'll just spend a prolonged amount of time thinking about why they're on it!
I had one member on my ignore list previously because they were randomly being an ass when I didn't even know them but since they haven't quoted me in months I'll take them off now. It wasn't anyone popular though.
When you add someone, you can go into a thread and their name will still be there but the post won't be. But there's also a "View Post" button so you can take a peek without removing them.
Oh. That's silly. I don't think anyone could bother me enough to do that.