There was a sound of whispering.

Then a smart blow on some metallic substance, effort, voices, and the vanes stopped.

A gust of snowflakes whirled into the room, and vanished before they touched the floor.

"Don't be afraid," said a voice.
Graham stood under the vane.

"Who are you ?" he whispered.
For a moment there was nothing but a swaying of the fan, and then the head of a man was thrust cautiously into the opening.