I think it largely depends on experience. What follows is a true story:

I was once sat in a quiet park in a small village on the edge of Sheffield, UK (Dungworth to be precise) with my then 6-year-old son. We had been playing football and were sat on a bench whilst he played a game on my phone.

From the other side of the field I saw an old lady hunched in a blue shawl carrying a basket walking towards us. I thought nothing of it first of all and assumed that maybe she had come to tell us ball games were not allowed on the field.

I looked up again and I could see the lady was not walking towards us but towards the bottom end of the field that disappears into a slope and finally some woods. The old lady went down the slope with her basket.

After a few minutes I started to wonder where the lady had gone. My son and I went to investigate. I assumed she had gone to a local farm for some eggs or somesuch and maybe knew a shortcut. As we got to the bottom of the slope we could see that the path into the woods was entirely fenced off with a wire fence and there was no way she could have climbed over.

Specifically this field into the trees at the bottom. The path between the Royal Hotel and Skyehouse Brook is not accessible from the fields: https://www.google.com/maps/place/Dungworth,+Sheffield+S6+6HF/@53.409429,-1.5801187,115a,35y,154.5h,78.93t/data=!3m1!1e3!4m6!3m5!1s0x48797fa3be00f629:0x18b985851ab822fa!8m2!3d53.406204!4d-1.58292!16s%2Fm%2F0m0pc5n

Where did she go? No idea. Were there any local legends or folklore surrounding this woman? Not according to the owner of the Royal Hotel pub. Did she climb the fence? Unlikely. Was she a ghost? Probably not.

I have no idea where she went or who she was. I have been back since and friends in the area have no idea of anyone matching her description.