Strange Cloth Rubbing

I was recording wind that blows in my window, but the zoom h2 placed on a (cheap) mic stand after some time started to bend itself downwards. It hit the curtain/drape in my window and rubbed itself against it until reached the lowest position - the mic stands arm stopped gently as it started. This produced a very interesting sound that i totally didn't expect to find on the recording. Edited with audacity.