That's a really brilliant write-up I enjoyed to read. I couldn't able to stop more agree with you that the questioner always teach you and he is one of the intelligent person who always tried to compel you think more.
God cannot lie for goodness and honesty are attributes that are possessed in full by him. Thus we need to consider the matter more carefully; could it have been a mechanism to bring Adam out of hiding and into conversation with God.
You hit the nail on the head. And, yeah I have time to ask more question to my father. :)