The shadows wavered, grew and fell. They were indeed shifting and appeared as though to come alive. A curl of fog moved slowly from the ground, wrapping around itself despite the breeze. The footsteps of the Guardsmen who'd just passed awaking the mist.
It continued to curl around itself, growing slowly and gradually. A small hand formed and the soft pillowy fingers wriggled in a new movement. The digits stretched as the shape grew further, grasping at the stone beneath the palm. An arm rose, and the shoulder and torso began to follow suit. A faceless head formed and stretched its neck while it shifted.
A fight broke out nearby, and the guardsmen's attention was directed elsewhere as the shift crawled itself from the dense fog in the shadows of the building. Testing its feet, a few steps were taken in the direction of the commotion that woke it from its slumber. A large black gaping mouth stretched unnaturally long; its jaw halfway down its chest as it screamed silently at the racket.
Twisting and bending, it's soft white plume limbs moved forward. Its path only ticks behind that of the two men in heavy armor now walking away from it. Following the noise makers for a few moments, it's dead empty eyes watched as the two departed.
With a snap of its head to the side, the misty legs began to sink back into the curls of fog at its feet. The body still moved forward; its path now along the shadows of the buildings but the same as the other two.
If they turned and looked they may see as the body of the beast began to crumple, the peace and quiet giving it no reason to continue forth. Its head would begin to crumble and disperse into the mist that clung to the thick wet bricks. However, if they didn't then no one may be the wiser, as curfew had indeed been called.