Okay kiddo, so imagine you're driving a big wagon with horses, called a carriage. The person who sits on the front of the carriage is called a postillion. They tell the horses where to go and make sure everything is running smooth.
Now, let's say there's a big storm with thunder and lightning. Lightning is like a big shock of electricity that comes down from the sky. It's really powerful and dangerous.
So, in this case, the lightning hit the postillion on the carriage. This would be very bad because it can hurt or even kill the person. It can also damage the carriage and scare the horses.
So, if someone says their postillion has been struck by lightning, it means they're very worried about the person's safety and might need help fixing any damage. It's important to be careful during storms and stay away from tall objects like trees or metal things that can attract lightning.