Young hobbits play bob-stones, which accounts for their accuracy. But it doesn't account for the force that would be necessary to kill something large from a distance.<P>Of course, orcs in general are easy to kill, as seen by the fact that our heros kill hundreds yet receive hardly a wound in return. Gamgee takes them out with pots and pans in Moria. Even in Boromir's death scene he never actually took a blow. It took three arrows while he was distracted fighting to fell him. But a small rock thrown from 30 feet at kills instantly. Go figure.
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