Yeah, I forgot to mention you can just walk closely around an enemy to get into position again. Unfortunately for me, battles quickly devolve into a smouldering plain of fire and smoke, so I often can't position myself where I like once battle's underway. Also, once you're revealed (i.e. not invisible any more) thieves tend to be squishy as hell, and go down pretty quickly. I think my thief dies roughly once every battle unless I just use her as a makeshift archer for most of it.
