Sleep Before Waking

You come upon the following scene:

You stop to take in the view, listen to the sound of the serene place. Suddenly, the trees rustle and the sounds of something approaching through the trees draws your attention. You turn to watch, waiting for something to emerge into view. When it does, it is otherworldly.

Prompt:

What comes from amongst the trees? How do you react? What happens?

Requirements:

Choice A) explore the whole scene in 500 – 1000 words.

Choice B) Quick response, under 500 words. (Quick response writers, post your work in comments if so inclined)

Ok, go!