This exploit is very simple. I also speak English, so it will be simple and Detailed.
https://i.imgur.com/ZxwV0vJ.jpg is a Link to the Screenshot so it's simple to Understand.
What you need is D.I.S.C.O. - Item - World of Warcraft Which is the TCG Item Called D.I.S.C.O It places a Disco Ball on the Ground, Which "Disallows anyone able to click or Interact with the flag"
This works in Arathi Basin, EoTS, AV, IoC, pretty much any BG that requires a interaction with a Flag.