How does Kanai convince Horen to go look for Fokir's boat when the storm is coming in Part V?

Kanai convinces Horen to go look for Fokir's boat when the storm is coming in Part V by reminding Horen of his long relationship with Fokir. Horen is also worried about Fokir and Piya, but he thinks they will not have much luck in finding them before the storm.