Cersei was partway down when a blast of energy leaps from the air beside the pit and smashes into the Ever-Turning Wheel assembly.  The metalwork melts (whatever doesn't fly apart, at least), and jams the cable with Cersei still about 10 feet off the ground.  The Ever-spinning Wheel goes flying away, still magically spinning (true to its name).<br/><br/>((Just a free sensory roll; Cersei rolls 2D Sensorics, 6, 2, reroll 3 = 11, which is enough that her senses are tingling with magic being used in the area, and I'm not talking the Energy Bolt, neither.))<br/><br/>There's an ear-splitting shriek, but none of you can tell precisely where it's coming from.<br/><br/>((That was the surprise round, and the one action the creature took.  Now we can all declare our actions))