you don't even get a cutscene or dialogue with Gortash when you enter his room.
Also happened to me. This is a bug. Had to reload. The only way to avoid it is to make sure previous combat ends properly before entering the room.
I reloaded. I reloaded to even being in Lower City before entering Wyrmrock Fortress. Every single time, killing the Banites on the first floor keeps me stuck in combat permanently, even after destroying the gadgets and traps. It's so annoying.
