You win football games with great line play. If you have a guy who is doing an outstanding job in that area you do whatever you have to in order to keep him.
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 .