A Touch of Amnesia
We rejoin our characters in the room we left them, which is now filling with smoke.
'Where's the smoke coming from?', asks our Mage, bewildered. The poor chap must be severely disorientated to forget about the bodies of the dozen or so Trolls burning at one end of the room. It's probably because he had to use up a couple of charges on his precious staff to create the Wall of Fire.