Useless Fact:

To pull off a double spike at a height of 4 meters like in The Spike, Nishi has only about 0.7 seconds to hit the ball. In real life, swinging your arm twice in that timeframe is physically possible. However, the second hit would be incredibly weak because you have no leverage in mid-air, meaning you can only rely on the mass of your arm. 

To deliver a "Full Power" spike without losing force, his arm would have to swing at a staggering speed of roughly 300 m/s to 400 m/s to compensate for the lack of ground leverage.Nishi can also generate lightning and a deafening sonic boom. This sounds a bit illogical since swinging at 300–400 m/s isn't enough to create lightning. 

So, here is the scientific breakdown:To actually generate lightning, he would need to swing his arm at a speed of around 5,000 m/s, which is more than enough to pull off two full-power spikes. At this velocity, the air in front of his arm is compressed to the absolute extreme, igniting into a glowing trail of plasma wrapping around his arm.This plasma, combined with the insane friction against air molecules, strips away millions of electrons. His arm essentially becomes a highly charged core with a potential difference of millions of volts.

The moment his hand makes contact with the ball, the intense electric field breaks down the dielectric property of the surrounding air. A bolt of lightning arcs straight from his hand to the ball. The sudden expansion of superheated air creates a thunderous boom.

(Just a fun read, guys! 🐧)

Nishikawa's spike