Stone spears were not an instant magic, but they were triggered after the wall was up. It was just in time to dodge the magic heavy cavalry's sight. The magic heavy cavalry did not really know how to fly. They leapt over the wall and fell onto the sharp stone spears.
The warhorses' armor was not as great as those that they were carrying and the stone spears pierced through the horses' chests and stomachs. Among the wailing of warhorses, the magic heavy cavalry that had not fallen into the trap suddenly slowed down their charging momentum.
The scariest thing about the heavy cavalry was their high speed charge. Forget the fact that they were holding lances, even if they did not carry anything, they would be able to knock the enemy dead with their charge. The quality of the cavalry was extremely high, the comrades in front were killed and the rest bypassed the wall and intended to pick up speed again.
