Dragon Age Sulendil Keep/Call me Imshael Quest Bug

I'm pretty far into the keep.  I've killed the two giants (epic) and I've killed the group outside the last door before Imshael.  Here's the issue:  I can't figure out how to open the door to get to Imshael.  The door is closed and when I try to open it, it says it is barred from the other side.  All the playthroughs I've watched has the door open already when they get there (I don't usually watch playthroughs but I've been trying to get past this for over a day, don't judge me).  I've went through the keep to make sure I didn't miss any enemies (thinking that maybe you had to kill all enemies to get to Imshael).  Everyone's dead.  The only thing that remains (and it's there everytime I reload) is a little red dot on my map where the last battle before Imshael is.  It says there is an enemy but there isn't anything there and my companions don't unsheathe their weapons like there is an enemy.  I climb the last steps before the area with Imshael, replenish my potions and the door is locked.  Am I doing something wrong or is it just a bug?