I thought Sauron's eye was "fixed on Rivendell" at that point because that's where the Ring was. With the Nazgul chasing the Ringbearer as far as the ford, I think it's safe to assume that Sauron was pretty sure that the Ring was in Rivendell.
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"Art is our way of keeping track of what we know and have known, secretly, from the beginning."--John Gardner
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