I am tring to get my last 4 rep so i am not a leacher anymore, and this was one thing that im not sure all paladins know about.
If you are about to die and you dont want to lose dura you use the spell divine intervention which requires "symbol of divinity" you will die but you make a friendly target be removed from combat and this is a great why to not take dura.
There are also many fun things to do like if your in a group that you hate and your tired of failing you can divine intervention the tank and he will lose all agro and the mob/boss will go to the target that is 2nd on threat.
Have a blast with this paladins.