One thing that reduced their power was that they were not all present. Also the fire wielded by Aragorn and the hobbits irritated them, and was something they feared. And maybe when they had hit Frodo with the morgul blade, they retreated, thinking that with enough time Frodo would surrender. Indeed, had Frodo been a man instead of a hobbit, he would not have resisted for so long. And Gandalf tells Frodo, that a few more hours and even Elrond would not have been able to heal him.
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Two beer or not two beer, that is the question; by Shakesbeer
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