Get your ally asteroids moving.
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Then hold down the left mouse button.
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Or use your keyboard.
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When your allies are yellow they are
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not attracted to you.  Instead they will
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keep whatever velocity they had before
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you released them.
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Move to the bottom left corner.  
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Then head towards the repulse ship.  
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As you are moving press and hold
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your left mouse button and eliminate 
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this pesky repulse ship!