The Citadel of Chaos

You grasp the rope firmly, step back, and take a run at the putrid river.
Suddenly, the rope snatches and whips with a mind of its own!
You quickly let go and drop down to the ground.
The rope drops on top of you and tangles itself around you.
You realize that it is not a rope but, in fact,
a long SEWER SNAKE, which wraps itself around your body and neck.