Hmm I played a paladin and I dident really need bubble to own some1 in a duel.. as ret pal you just keep close.. stunning and the fight is over in a sec.
Though I also played a shaman, shamans just dont need to act like a warrior if they duel a pally or warrior cause they are stronger then you anyway.
As elemental I recomend to keep em as far away with frostshock and maybe frost weapon and spawn lightn bolts and use fire totems.