What happens when the negative and positive charges collide during lighting?

The negative charges from the clouds and the positive charges from the ground meet, and then they flow in both directions and hit each other, right? So what happens then? They hit each other and just disappear? Why don't they hit each other while they are in the cloud? Just because there is an equal number of... show more The negative charges from the clouds and the positive charges from the ground meet, and then they flow in both directions and hit each other, right? So what happens then? They hit each other and just disappear?

Why don't they hit each other while they are in the cloud? Just because there is an equal number of positive and negative charges in the cloud they don't hit each other? Why?
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