The theme is that brain is better than bronzes. The cyclops thought that he was not getting defeated because they were tiny men. However, they made up a plan to escape. Then they escaped and out smarter the giant.
Nohbdy wanted to kill the cyclops. However, he jammed a rock in the door way so there was no way to get out. He could not kill him ir else they would just die eventually in the cave with his men.
Nohbdy was trying to figure out a plan to save his men. He did not want to make the wrong move and more of his men get killed. From the beginning his men were dying and he did not want it to keep happening.