When you right-click on an inventory item, it gets set as your current "spell". If you use the Tourist consume ability to eat something that can be set as a "spell" in this way (like a crossbow bolt) your current consume ability becomes blank. This is a minor annoyance, but it could point to something sinister, since it seems that the game is both "eating" and "equipping" the same object... so I thought I'd point it out.