Pardon my technological naïveté, but what happens when you activate the 'blocking' option?

Does the poster being blocked still see my posts?
Can they post comments to my posts?

I assume that I will not see their thread posts. Is that correct?
Will I see what they post to the threads of other contributors?
Will Imsee what they post to the blog?

No rush to respond to this. I will check back.