Well, basically, it's your turn now. You know the location of only the nearest guards. They don't know yet what happened. Whether the doors are open or closed is unknown until you check. The blue square is the doctor.
Since the prisoner isn't supposed to have a cloak, he has only 400 mana, and 200 has been spent. And the guards will be here soon, so there isn't much time.
Apparently, the first thing to do is to finish off this guy and loot him for goodies. What do you think?