This is probaly common knowledge, but some may not know this.
I also searched and could not find any other topic stating this. So if there is and I didn't see it sorry !
To flag the opposing faction you might want to have another buddy with you in case things get out of hand.
Step 1: Make a macro such as
/pvp
/forfeit
If you don't want to make a macro just type it really fast ! During the duel
*When using that macro during the duel you will be "stunned" for the 3 sec.
Step 2: Duel the Enemy using
Code:/duel
Step 3: Get them down to whatever % You feel like. Make sure they are still attacking you when you do this.
Then just click the macro once if they are still attacking you while you do this they will be flagged
Step 4: This is where your buddy comes in. They enemy is flagged and he know will rush in and kill him with you.
This is great to kill those noobs your really hate on the opposing faction.
Have fun !