This is a second edition of a forum thread that has been dead for quite a while now (though that may be an understatement).
Basically, the previous poster’s avatar is protecting you from the avatar of the poster before them. Basically, they’re standing between you and your attacker. Don’t forget, you can defend yourself if your defender fails.
I’m going to create a fake poster just to get things started sooner.
This is the “avatar of the poster before me (unless you’re ok with not going when you post next)”:
Good luck attacking me when there’s an entire MOUNTAIN in the way. I go for a mining trip by digging a tunnel under a tree by breaking the bottom 2 blocks, digging straight down through the dirt, then replacing the logs and the dirt below that. Then I dig a 2x1 downwards tunnel. I do all that whilst crouching, and Idelac is left clueless as to where I went when he arrives on the other side.