In my case, there was a miscommunication really. One guy decided he was going to do the sailing, and while the rest of us talked about what we were going to do, he kept on about what he was going to do, so busy doing so, that he ignored us planning the battle. When I tried to resolve it within the battle, I was unable to, and it wouldnt let me take the wheel over.
The unfortunate outcome was that I am very disappointed, and feel sorta jipped outta finishing my quest.
Everyone was so sorry afterwards, and said "lets do it again, and you can sail", of course, I could not, the quest was finished.
My only hope is that individual lets me sail HIS boss battle when he gets to it. (I wont hold my breath)
<added> Talked to Live Chat support... Nothing we can do!
I said, Yes there is. You can cancel my account, and refund my money.
Suddenly I got a, hmmm well why dont you submit a bug report and we'll see what we can do.
In the meantime if it happens to anyone else, I suggest you immediately logout, so it doesnt register you as having completed the battle.