The chief asked them why they questioned him, and they told him how I claimed to see pirates dragging one of the girls away. They referred to me as a "mysterious traveller." The chief apparently scoffed at that and told them to "bring" me to him as a way to tell them to kidnap me. Donatello and Nathaniel left immediately after that and returned to us to tell us the news.
We planned to show the townspeople their chief's true colours after we confirmed that the house I saw in my dream was in fact the chief's home. The plan started the next day with Donatello, Joan, and Nathaniel leading an angry mob of civilians and guards to the harbour to confront the pirates. The pirates denied all claims and that's when Donatello came clean and told them about their chief.
Even after they told them the truth, many didn't believe them. As proof, they convinced them to head over to the chief's house, and they were more than ready to expose him for the monster he truly was.