I kind of want to follow up on a panel presentation by someone who works on a very tangentially related issue to the stuff I work on. I'm thinking of emailing him along the lines of, "Hi, I only got to ask a quick factual question at your presentation, but don't you think it's interesting that XYZ?"
That email wouldn't be for any purpose other than to continue the discussion that started at the conference. I can't figure out whether it's normal or presumptuous to assume that this person would actually want to continue that discussion with a random person he hasn't actually interacted with, apart from a small question? (I tried to look for him later at the conference, but it was crowded. I suppose I could have gone to later sessions he was going to be at, but that seemed too much like stalking to me.)