I hope Arwens' not at Helms deep too! but I can see why they put the love story angle in the first film, it helps to explain things to the non-readers watching, introduces the obligatory 'love story' early on, and I suppose that replacing Glorfindel with Arwen was the easiest (and cheapest) way to do it. Quite frankly I was surprised but delighted that there were so few changes from the original plot, long may it continue.
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