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Well as i do not play a Nightblade but do play a Sorc with duel wielding both bars i would say it just depends on the situations as to what you need. if you can close the distance between your enemies fast i would assume go duel wield for both bars that is what i do on my sorc and i find it does help to have one bar for magic abilities and one for Stamina and helps increase my dps output.
Those who walk in the night beware the shadow's hand