Once that beast reached the top, before it could even place a hand over the wall, there was something invisible that stopped it.
There was a layer of spatial laws that suddenly appeared above the walls, creating a horizontal wall that didn't allow anything past it. This wall spread all around the city, creating a circle along the edge of the city walls.
After a slight pause, the wall began moving down towards the ground.
It pushed down on all the beasts that were climbing on the wall and pushed them all the way down to the ground. The beasts on the wall were crushed into the pile of corpses on the bottom and then along with the pile of corpses, they were crushed into meat patties at the bottom of the wall.
The pile of corpses had been completely flattened and the footholds of the beasts had been completely destroyed.
However, this wasn't a complete flattening since there were a few things sticking out of the ground.
