In the presence of a pedophile?

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It was midnight. I was exiting off the highway, still going pretty fast off the bend onto the street when I saw something that made my stomach lurch. Just before I reached the street I was exiting onto I saw an older man talking to a little person. The way it looked to me was like this: Man had hands in pocket of sweater looking down at the little person and the little person looking up at the man. I thought the man was trying to coherse him into doing something. They were also standing at a weird spot close to the street but still on the bend of the exit. There is no sidewalk there so that was why I noticed them. It was a few seconds before I said anything to my passengers. They were thinking the same thing I was thinking. When I turned around in my car to go back in the direction I saw them it seemed that they had moved to behind the fence and were off the highway bend and the little person looked like a smaller guy. I couldn't tell if he was a short guy (adult) or a child. I couldn't get close enough or else I would have gotten into an accident with others coming off the highway. I got as close as I could and drove slowly pass them and couldn't make out if this person was an adult or a kid. I also began wondering if I was overreacting with what I saw. Here's why. When I drove back I noticed that they were behind the fence and not on the bend of the highway exit. They couldn't have made to where the fence started and back to the same spot they were standing in the time it took me to drive back. When I finally drove off we were pretty quite. I didn't know what to think. What would you do? How do you know? Have you ever been in a situation where you had to question what you saw or think you saw?