As lots of people have said the Nazgul are probabaly a bit scared but fire would burn their cloaks and then they wouldn't have their element of fear and water has the same reason.On Weathertop Frodo just cut the ringwraith's cloak,not hurt him.If Frodo had "hurt" him then the siege of Minas Tirith would be a bit of a waste and then again their goes their fear element.
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