In his trial at the Diet of Worms, Luther decided not to recant his writings. Many people were thrilled that he didn't, but many others were angered by the decision.
Do you recant or do you not?
I do not recant.
When leaving the Diet of Worms, Luther was fake-kidnapped. Luther had powerful friends, one of them was a prince of Germany. His friend was so worried he would be murdered after his trial he had Luther taken away.
You're coming with us.
Luther stayed in hiding for a year, and during this time he continued to write.