I'm impressed that you managed it. I'm with Boeroer, there's a good chance no-one else has done it. I would have thought the QA crew would have been going overtime trying to break things like this, but sometimes simple things like this just get beyond them. However, logically, since I used stealth to get past a lot of the encounters here until I went past them to go back and kill what I considered raiders, the fact is that getting closer to the siege perimeter becomes increasingly more dangerous and that makes sense. So, it's not completely illogical.
I will say this, if you can't handle Baelorin, you need not worry about the end boss in the overall area. Any incoherence in this post I will shamelessly blame on wine.