This is a football player wearing a metal necklace in training. Lightning struck the necklace, causing the player to get an electric shock. Lightning protection experts said that football fields are generally divided into open-air, semi-open and closed courts. The empty playground is empty and flat, and the wind is easy to "drive straight in". Rapid friction with the ground of football field will generate a lot of static electricity.

Clouds above football fields often carry a lot of charge. Clouds and the ground form a huge capacitor. The charges in the capacitor are on the verge of explosion because of mutual induction and mutual transfer. In a closed stadium, the possibility of lightning strike is not ruled out.

Lightning is often accompanied by strong winds and heavy rains. In the absence of shelter measures, the continuous light rain soaked the players and turf on the field. The air containing water vapor on the ground is baked and heated by the high temperature ground, and the temperature gradually decreases, forming aquatic products such as raindrops and hail. Under the action of gravity, water particles collide with cloud particles.

As a result of the collision, particles with positive and negative charges gradually separate to form charged clouds. Charged clouds move with the airflow under the action of wind. When the charge accumulates to a certain extent, it is just pushed across the stadium by the wind, and it is easy to discharge.