I did a search and made sure this was not a repost.
Now, when I am about to capture the flag in eots, or steal a base in AB, I ALWAYS hate it when rogues come up behind you and sap/attack you. Here is a little trick to catch these bastards!
I found this out by complete accident just a little while ago while doing some pvp in AB. I accidently had the 'v' key. By default, this places a health bar over the enemy. I did not bother to click it off since I was really into the match, Alliance was winning!
I noticed, while fighting, I could see the health bar creeping up on me from behind. As a mage, I frost novad and found that it was a rogue trying to get me. I kept on fighting and I kept on seeing bars out of no where when I was close to the stealthed player. This gave me a HUGE advantage and people would go like WTF? when I frost novad them and killed them.
Unfortunately, this does NOT work in arena for some reason.