Gandalf Vs. The Witch King

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Originally Posted by Mansun

Because of these concerns, the Witch-king failed to observe the withdrawal of Frodo and his companions from Weathertop and he lost track of the Ring. It was not until later on October 7 that he resumed pursuit".

I thought that the lack of pursuit was two-fold: One, the W-K guessed, sans evidence, that Frodo would quickly go over to the dark side from the Morgul wound and two, that the noon day sun always drove out the images of the proto-Fellowship from the minds of the Nazgul, and so each evening they had to start over again, the analogy would be you looking for something such as a rabbit in a field, and each night having to stop due to the lack of light.

And truly the Nazgul knew fear.