Rodoroc Throne Room

Ok, so I am currently doing the dwarves and doguns part IV quest, and I made it all the way to the hallway leading to the throne room in Rodoroc but then, being the imbecile that I am, I walked backwards out through the exit before I talked to the king/whoever else was in the throne room (I don't know who is there, I left b4 I could find out) because I was curious to see what would happen. So, naturally, I thought that there would be an entrance to the throne room somewhere in Rodoroc so I could finish the quest, but I can't find one anywhere. My question is this: does anyone know if there is an entrance to the throne room, and if not, can I get a tp to it or something to finish the quest?
Thanks in advance

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I am reidf160 ingame if anyone needs that info

 

Try waking through the portal again.

 

Nope. Once you enter the portal you cant leave or enter Garaheth. That seems like the most logical answer though, so I'm not sure why the devs even let you go through the portal after defeating him.