Green light shining down on us, followed our movement for five minutes before disappearing.

My home girl and I were hanging out one night on Mt. Charleston, and all of a sudden, a light appeared above us.  But it wasn't like a typical helicopter light, it had a greenish hue to it, which is non standard police helicopter searchlights.  We both turned to each other and ran away from the light.  We heard a low whirling noise follow us for about 5 minutes and the light and noise disappeared.  We are still shaken about this and haven't told anybody what happened that night.