Same thing happened a group of friends in Pakistan. We were coming back from a hunt, and at night it became pitch black. The moon was in some dark phase and there was virtually no light. All we had was a small flash light which the guide was carrying. We came across a small lake or a ravine and the guide stopped and turned off the Flash light. He pointed to a area roughly 150 yards away and we could make out a silhouette of a woman sitting and taking a shower in the river. Her hair were all opened and were inside the water. Whatever small moon light that was hitting gave a little glimpse. Now the area we were crossing was pure Forrest There were no villages or settlements for at least a mile.
I think that we saw a forest spirit that day in a form of a woman. The spirit determined that a bunch of men were walking through so she appeared in a lustful apperation of a woman taking a shower. Hoping that we would take the bait. One of the guys jokingly voulentered to go up to her and take a picture. But the guide turned around and gave him the most angry look with his eyes all wide. That’s when I realized we had come across something serious. We continued to move through the forest but quickened our pace. We finally came across a “dhaba” local tea/resturant. There we told the story to the natives and they said that the woman had been appearing in the forest for a really long time. She is a spirit of an Indian woman who was killed or sacrificed to some hindu God or she was cremated along with her husband which is a hindu tradition.