I've started HotU two times with the same arcane archer character. On my way into the Underdark, I've picked up Sharwyn then immediately taken on the group of drow and duergar around the corner. I sell off those goodies, go back down and head over to try my hand at the sleeping Blue Dragon. Both times it looks like something has triggered and locked the door, thereby locking me out of the room. I almost never take Sharwyn with me, but I've played this module many times in the probably 15 years I've owned it both on disc and from GOG and this has never happened before. Is it possible that Sharwyn is able to do something that triggers an area of effect into the next room? I can't think of anything I'm doing as an arcane archer. The fireball arrows only do a small area of effect. Since I'm fighting at range, I'm staying out in the hall, so anything the enemies would be doing aren't aimed in the direction of that room. I know it isn't THAT big of a deal. I could theoretically skip it and move on, but I know it'll also aggravate me to no end that I wasn't able to complete that room.