Nothing hurts like a cancelled vacation, more so when it's a fishing trip!
Shame you couldn't find a way to still go, providing your friend was cleared for travel.
Hope they can work some kind of deal where you can recoup what $$ you can, or maybe reschedule for a future date.
Heck, it never hurts to ask, and make sure to lay on the sob story about your friend's injury.
Well, anyway, hope for the best!