The Drunken Lizard Pub

I am on the Grimmhold maintanence level. I entered a room with three caged Noximanders. The northwest corner has a chest. I open the chest and the Noximanders are released! I kill the Noximanders and get the stuff out of the chest. I am unable to leave the room! The entrance way is now blocked! I see no other way out of the room. Did I miss something?

Do a thorough search of the room now that you have access to some areas you didn't before

And if you don't find the way out

check the middle cage!

That room got me too. Just had to search a bit.