Arghhh... I overrode the nearest save before fighting for the Cloak and the next closest one is in the Asylum. I don't think it is significant enough to bother with - the game went on just fine. I cleared all the folders.
I'm not sure what to say about Kelsey ... but you should feel bad if you let him get swallowed by a big fish!
I do feel sorry, but there really isn't anything I could do about it - the fish seemed to like him, it went after him both times. BTW, is there any chance you can replace the Imprisonment effect with a permanent (until the thing dies) Maze? In my case, Imprisonment did nothing to Kelsey and Minsc, but it could mess things up (most notably Jaheira will say "We must make haste to the Harper hold in Athkatla" and leave and the protagonist gets instakilled).