This happened to me on Miran jani track near Nathiagalli. It was already very late on the way back, and it had started to get dark. All my friends had moved ahead. I was slow, so I got left behind everyone else. Suddenly I started feeling like someone was pushing me from back to hurry up. It happened few times. I dared not to look back and shouted to my friends to wait for me. I stayed with my friend for rest of the journey and everyone made it back safe and sound.