Dont think they work that way, movie was a fake i think it would be hard to make power conduct work that way and split energy, however it would be cool if you could make the weapon into a 2handed sword like in JK3.
This should be possible to move the crystals energy from one place to another, would also allow more honor fighting, if you face alot you have both blade side active, if fighting one you could put blade down to one blade, allowing a fair fight.
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For information: Double sabers are two sabers, fixed in the middle!