Strange things in the forest. Final

Back in Appalachia, out walking at night to clear my head, came upon this eerie sight. A strange whirring sound could be heard coming from the source. Couldn't get closer to see where the light was coming from because of a strange force field of sorts pushing me away. I will go back again in the daylight and try to find some evidence of what was there. Blender 2.79, with a little help from Andrew Price's Grass Essentials and Backdrops. Final output at 3840 x 2160 pixels, 2000 samples. For those who want to know, Filter Glossy at 2.00, Reflective and Refractive Caustics turned off, and indirect clamping at 0.50 to reduce the few fireflies I had in the final render. Minor lighting and color tweaks done in Adobe Photoshop.