pushed        kicked          until 
The bulls were very angry and blew fire and smoke from their mouths.
This made the cruel king glad. But the people who saw it were afraid.
They did not want Jason killed. They did not know that the princess had helped him.
Jason pushed the bulls' heads down to the ground. Then they kicked at him with their feet, but could not hurt him.
He held their heads down on the ground until the plow was ready.