The storm is bad enough that the sailors send the passengers inside, and then it's bad enough that the magicians go back out again to try to help.
It's not enough. There's too much storm, and they're washed overboard and Kerem's attempts to get his highness dragged onto a plank of broken ship may or may not get anywhere, it's hard to tell because it's dark and loud and salty and his lungs are burning and