Id say that the whole surfing scene was done to add a little spice to the battle for the non-LotR fans. About the elves appearing, i think PJ just wanted to make the story a little bit easier to follow and more believable for the non-LotR fans. I dont think that someone watching the movie who is not into the LotR would think that those men could hold off all of those orcs. Just my opinion.
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