Well, imagine you're playing with your toys and suddenly one of them breaks. That's what happened at Antioch, except instead of toys, it was a very important religious artifact. The artifact was a holy staff that was said to belong to a very important religious figure.
A group of people were carrying the staff in a big procession, which means they were all walking together in a kind of parade. Suddenly, they all heard a loud noise and the ground started shaking. People fell down and the staff was dropped and broken into many pieces.
Everyone was very upset because they believed the staff was very important and they had just broken it. But later, they found out that it wasn't really the ground shaking that had caused the incident. Instead, it had been some people who wanted to steal the staff who had caused the disturbance. They had set off a big explosion to distract the people carrying the staff so they could steal it.
It was a very scary and confusing incident, but thankfully no one was hurt. It taught us that we should always be careful when carrying important things in big groups, and to look out for people who might be trying to take them away from us.