This will prevent Chris from sending you messages, friend request or from viewing your profile. They will not be notified. Comments on discussion boards from them will be hidden by default.
“I went down to the 24-hour grocery. When I got there, the guy was locking the front door. I said, 'Hey, the sign says you’re open 24 hours. He said, 'Yes, but not in a row.”
―
Steven Wright