How does Raka come to see that he has been wrong in his assumptions about Bowman, Kestrel, and Mumpo in the novel, The Wind Singer?

Raka, the king and ruler of the Ombaraka people, is very fierce, very short, and he believes at first that Bowman, Kestrel, and Mumpo are Chaka spies. When the three of them save the Baraka fleet from destruction, however, Raka realizes he has been mistaken.