So my friends and I were playing a game earlier and we got into an argument about what happens when the Trader wants to trade with the Seeker. The situation was that I, the Trader, was asked "are you planning on playing an attack card higher than 10?" to which I answered yes. When I then attempted to trade hands with the Seeker he told me that I couldn't do it, because he had no attack cards higher than 10, which would therefore make it impossible for me to abide by the terms of his question. I thought that the Seeker's power had an implied "if possible" in it, but they decided I couldn't trade because I had to "take every action possible to remain in the terms of the question".
I looked in the FAQ and didn't see anything Seeker-specific. Does anyone have an idea what would happen in this situation?