I am in Stormriven, and I got a quest to go talk to this bug-like dude in Sorcerer's Sanctum, and instead, I got a duel! Even AFTER the duel, I still didnt get to talk to him. Any advice?
That's Karolak Nightspinner.
You don't talk to him afterwards. You defeat him, collect the Celestian Portal then go talk to Leland Hawkins. I think the portal was an automatic quest update, if not it should be lying around the ground somewhere in his chamber.