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Because if not -- now,
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I am in the situation where the guy next to me has beaten you up,
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but I can now get her
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and I can step in here,
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and the guy behind me can do the same,
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and so we can create a wedge in which we are doing the killing
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and they are doing the falling.
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If enough of that happens,
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after awhile some sense of what's happening up front
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quickly works its way to the back,
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and there can be a moment,
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and there always is a moment in a hoplite battle,