Alrighty here are my topics for the day.
1. I attempted to play No Quarter and Die by the Sword after winning a military challenge with Maege Mormont. My opponent said that I could only do "one response per trigger"; Maege was both my only participating unique and my only sword crest. I think I would have been able to play them both; I understand that you can only activate a response once per trigger, and I believe he may have gotten confused with that rule, but these were two separate responses.
2. My opponent attacks me with two deadly characters. I defend with just Ghost of Winterfell and consequently he must die to deadly. Can I trigger his response? I believe so, but we weren't sure.
There was more stuff but I can't remember right now.