It's funny you mention this, because I always wondered the same thing. The way they make it look in the movie gives Aragorn ample amounts of time to shoot and cut some Uruk down. Few arrows in the arsenal is a good point.
In the book Legolas runs out of arrows during this battle.
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"Loud and clear it sounds in the valleys of the hills...and then let all the foes of Gondor flee!" -Boromir, The Fellowship of the Ring
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