Camo Coffey

I've just fought Maura in the Oratory of Earl, but the fight won't end. I'd read elsewhere that this bug can occur if an opponent is off screen, but I made sure to run around the area before killing the last creep. And now all my characters are completely frozen, I can't even move about to look for more possible enemies. This has happened four times now, and I can't see how to proceed.