The strange figure in the long coat pushed the door and stepped out onto the roof.
It was immediately apparent that it was not human.
It walked as if it were a satire of bipedal locomotion. A leg, or some kind of naked sinewy and scaled limb, protruded from the coat, probed ahead, and found a place to set down. The tip of the serpentine limb coiled onto the roof and supported the weight of the rest of the figure as it swayed forward to repeat the process.
From the top of the coat protruded the head of a snake.