What's the trick of Naruto Lei Ying?

Thunder Escape from Hell Assault-Four Fingers Crossing Hands (Four Hands in Hell Sudden): Focus chakra, the attribute of thunder, on the fingertips and stab the enemy. The fewer fingers, the greater the strength. It is the strongest skill of the three generations of Lei Ying, and is called the strongest spear. Protection of thunder shield: Thunder shield strengthens its body, puts on the clothes of thunder and lightning, and enhances its defense. It is called the strongest shield (hope to adopt it, thank you).