I am durge, you bitting the hand off is avoidable and gives you nothing in return. There are unavoidable kills in the story (only in act 1 underdark so far). Depending on your class you can mitigate durge outbursts. If your playing barbarian or fighter thou good luck passing the checks to do so.
oh theres more. even before the underdark that are unavoidable. with any class whatsoever. but that's not what i was asking.
Is the dragonborn race a prerequisite for this scene?
I don't believe so. as you can completely customise the dark urge in any way you want