What Pride Had Wrought - Well of Sorrow ... Glitch?

I was just wondering if anyone else is having the same problem with the What Pride Had Wrought Quest?

After deciding whether or not to partner up with the sentinels, there are two locked doors in the main room (you can't go back), so I proceeded to go east. I keep going until I noticed there was a sentinel on the ground where supplies are replenished and such. However, after that point I'm stuck. I read FAQs, watched videos and apparently up until this point, there should be a lever hidden for the party to pull to continue to the well of sorrow. 

For some reason, for me at least, there's nothing there. I don't know whether it's because I'm missing something? Or went the wrong way, but would like help if possible!

Thanks!