Yes, defense is an existing objective.
I was in the area, and the command I put in the description was copy and pasted from the command block.
I don't understand this at all. A second it ago it worked. Then I went to try it again a second later without changing anything and it wont work.
I tried that earlier and tried it again. Doesn't work, and I don't think it ever has.
Ok, thanks, I see now. Sorry for the waste of time.
I made a video on what I see: http://youtu.be/CjAgbAy0jI8
In the third screenshot it says you are standing on -15, but looking at -16. I might record a video tomorrow to show what I see when I go in game.
Look at the last screenshot. You are apparently at different coordinates than the ones you are looking at.
as it turns out, you have to actually have a score of 0, not no score at all for this to work. I have it working now.