Okay so we shall start with the sunction.The concept is easy- using the oncoming chakra as yours. The secret is that you start molding the chakra of the jutsu in the momment it touches your arms and you are using that chakra to power your own lightning jutsu.You know the principle how you mold lightning chakra so it should be easy.
*shoots weak lightning bolts at you*
your old sig was the shining right?
As I see you release a wave of lightning, i extend my hand and start to mold lightning chakra. Than using the lightning that you fired, i "suck it up" and use it to power my own lightning that i release back.
Raiton: Bakurai ) - Lightning Release: Depth Charge
Rank: B
Type: Offensive
Range: Short - Long
Chakra cost: 20
Damage points: 40
Description: After enveloping themselves with lightning, the user emanates a powerful bolt of electricity targeted at their opponent.