The thing is, I have to work out the details of the capture. I am, in fact, all but bursting with ideas about that capture. Wolves and other monsters; a last stand against a cliff; and more. But I can't use 'em all, because they are incompatible with each other.
And many are incompatible with the rescue. There has to be a reason why that character rescues him when, without considering the circumstances of the capture, there's one major and probably several minor characters who are more plausible.
Not to mention that I have to figure out where he is at the time. Possibly knocked unconscious at the scene of the battle?