What is the phenomenon of seeing floating light indoors in thunderstorm weather?

This is spherical lightning, which usually happens in thunderstorm weather. It is very bright and slightly spherical, with a diameter of about 20 to 100 cm. Usually it lasts only a few seconds, but there are also 1-2 minutes. Even more amazing, it can move independently and slowly in the air. Witnesses saw it fall to the ground like a fireball and bounce back into the air and disappear. Some witnesses said it would follow metal objects, such as telephone lines, but most people said its path was uncertain. Most witnesses said it moved horizontally. In its short life of a few seconds, its luminosity, shape and size remain unchanged. It has appeared in open spaces, closed rooms and even airplane cabins! There are signs that it is closely related to lightning between clouds and the ground (that is, common ordinary lightning), and witnesses say it will form or disappear after ordinary lightning. Spherical lightning may explode violently, or it may suddenly disappear quietly. In terms of color, opinions vary and there is no consistent description. The destructive power of editing this paragraph

Spherical lightning is destructive. It can not only destroy the glass window, but also make the outer layer of the wall peel off. It also caused human and animal casualties, but due to insufficient information, the real cause of death has not yet been known. There is no evidence that ball lightning will destroy trees, which is slightly different from ordinary lightning. Spherical lightning can hardly be destroyed Someone once used a rifle to shoot ball lightning, but it didn't work.