But the angle of its economic trajectory has dropped.

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Sensors at the midway point of the table detect the angle, speed, and trajectory of the not-exactly-oncoming puck, and instructs the mechanism how and where to fire the disc -- you slap it back, and the same sequence happens on your compadre's end.

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In an extraordinary scene, Mr Boyce demonstrated that the angle of the round's trajectory meant the weapon must have been pointed at an awkward angle for someone intending to shoot himself.

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