Sure, Double Saber Cut is pretty simple, as you have been -presumingly- taught, the Lightning Saber technique or wait.. I think they no longer have that one on NB >.> *Just checked*
So... you basically release lightning chakra out of your hands and manipulate it to the form of two swords, you then preform a cross slash with those lightning sword, causing them to fuse into an X shape that travels forward. The longer the lightning technique last traveling, the weaker it gets until it eventually disappear, but if deliver at close range, the technique obtain extra power. This technique can also be preformed through weapons such as swords or daggers.
Lightening Element: Double Lightening Sabers Cut - Raiton: Futae Raiton Gontuo Kire
Type: Attack
Rank: B
Range: Short-Mid
Chakra Cost: 20
Damage Points: 40 (+10 at short range)
Description: By manipulating your lightning chakra through your hands and making a lightening saber in each one of them, you can fuse it together in one X like slash directed at your opponent, or if you hit it directly to your opponent it will be more effective.
Any question?