It is an image of holding a kunai (knife) in the left hand and activating the technique from the right hand.
It's like a counterattack after landing on a wall or a steep roof while dodging the opponent's attack.
If you want to get a sense of speed, I think it is better to tilt your body more, so in that case, if you change the angle of your hips, the whole thing will tilt, so please try it.
左手にクナイ(ナイフ)をもち右手から術を発動させるイメージになります。
相手の攻撃をかわしつつ壁や急こう配の屋根に着地してからの反撃という感じです。
スピード感を出す場合はより体を傾けた方が良いと思うのでその場合は腰の角度を変えれば全体が傾くのでお試しください。