I started up a resume on siege of the warmind two days ago when you get to the part with all the thrall spawns to get some bounties done, and the door was open at the end of the hallway past the left you're supposed to take that leads you to the final room. There is another door at the end of that room that is shut, but approaching it changes the direction of your mission marker. Clue?
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Anyone else try/notice this?