Giants throwing stones at each other, that quote taken from the Hobbit just signifies a storm or earthquake or simply rubble falling down the mountain. It is just a metaphore used to emphasize the semblance of chaos. Giants could also be seen throwing bolts of lightening or causing avalanches. MIddle Earth did not have the national weather forecasting association, natural occurances could easily have been associated to Giants or other super natural creatures.
Giants had no place on Middle Earth.
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I can't believe I have not watched the return of the king yet.
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