A massive wooden drawbridge door opens out into a long bridge. Having come in hidden you didn't get to see too much of this, but just outside of the main gate is a 100 foot long stone bridge. Many castles are surrounded by moats of water, this instead has a moat of open chasm. The entire fortress rests on a single pillar of stone that goes down hundreds of feet.
As you reach the half-way point you feel the bridge and ground start to rumble again, massive cracking noises are heard as you race across the bridge. Turning back one more time you see the entire ground and walls around the keep are shifting, tilting just so slightly, yet the scale only makes it seem slight. As you finally cross the bridge you watch as the pillar holding all of this up starts to crack and fracture, buckling. The entire fortress sinks into the chasm and a few moments later the ground shakes violently once more. Then there is an eerily stillness.
You are no across the bridge from where the fortress once stood. Aelar has most of his troupe, you still have some of the survivors from the prisoners. You also have a mysterious new traveler who mentioned something about bringing Talia back before the keep began it's collapse.