If you tried using "sub_EVENT_SAY" then that would be one problem, you have to remove the underscore between sub and EVENT. So, "sub EVENT_SAY" is what it should look like, and without the quotations obviously. If I remember correctly, NPCs are not supposed to respond while in combat with you. Sorry this post probably isn't as much help as you would like but I'm not sure how you would go about making him respond. I don't think it has anything to do with the quest as much as it does the game.
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