((Please bear with how Stupid this thread is going to look without any links. I've been trying to post a few things on Mmowned for weeks and I've heard nothing from the moderators))
I was exploring shadowfang keep and I found my own way out of it. Type in Relbros at youtube and you should see my video at the top of the list
I have done some searching on mmowned and have found a few different ways out of SFK, but none of them were my way and it was all before Cata. Because Blizz changed SFK, the content within instanced Silverpine was change as well.
If this method of getting out of SFK has already been posted, feel free to link it and I apologize. Thankyou for your patience and I hope I'm contributing to MMowned in some sort of way.