"Ah, so this is the right track. Also, you're a poor liar, but I already guessed that, you don't hide your emotions by default and that's necessary to lie well. Right, so... spells. Nothing with substantial trade value, so... oh, you gave someone a basic wake-up ward. Maybe a straightforward fire or shock spell for obvious mals. For a pittance, maybe free. Stupid, because you might be able to trade your variant to someone, but not very stupid, because you wouldn't get much. And they'll be complete dead meat without it, and with it they'll have a chance. And now I've figured out part of the puzzle that is you."