Once you're far enough, Brother Kidd pulls the rope, and you hear the collapse at the far end. With an extra pull, your companion is pleasantly surprised to bring back his rope.
"We are in luck. I feared it would get stucked under the rocks. Perhaps we will not have to leave by the front door."
You reach the end of the tunnel, and find yourselves in a battleground. The soldiers awaiting your exit (including the two you fought before) are battling the ghost you've met, and not managing too well. You slip out before they can intercept you, and quickly backtracking toward your entry point.
Reaching the roof, you see another group of guard waiting outside the front door, with floodlights pointed at the exit. Brother Kidd peers into the darkness around the castle, trying to pick a good place to head down. That's when you notice a sharp whistling noise coming from above. Looking in the darkness, you suddenly see it. The glint of moonlight on metallic wings.