In chapter 4, Simon visits Daniel and invites him to the synagogue to hear Jesus preach. Daniel goes with him, but reluctantly. He is a zealot, meaning that he thinks the only way to overthrow the Romans is by force, by fighting them. Jesus preaches a message of peace and nonviolence, and Daniel just doesn't believe that is the way to achieve freedom. On his way back to his village, Daniel can't help himself--he throws a rock at a Roman soldier and is beaten by another soldier. That convinces him that peace is not the way to freedom, and he leaves to rejoin Rosh and the other zealots.
Click on the the link for more information.