Me and my sister grew up in a trailer in the boonies, with our mom and dad. It was always creepy and strange in that old hollow, not only was there an abandoned old church right outside our bedroom window that you could hear ghostly preaching and singing on some nights, but there was also an old cemetary in the field on daddy's land that had headstones dated back in the 1800s that still had soft ground and maggots. There are so many ghost stories of our childhood home. From a little ghost girl to my dad seeing a disembodied ghost leg standing in the middle of the living room and one of our dogs licking it and the other dog standing on the television barking at it. Here is just one of the many stories that played a part in my fear of the dark and long hallways to this day.
When I was about fourteen years old, my cousin spent the night with us, he was about twelve. We had been out all day and didn't get home until around 10 o'clock that night. There was a long hallway in our trailer my sister and I were always afraid of. So it was dark and I asked my cousin to go turn on the hall light so I could go to the bathroom. As we were walking through the hall we heard the door to the bathroom bang open against the washing machine. Mom and dad yelled and asked what that sound was. When we looked around the door we saw what looked like a girl in a wet green dress with long stringy black wet hair over her face crawling out of the bathroom. Needless to say we screamed and didn't walk to the bathroom alone for years.
I do believe the just a leg thing. I've seen just an arm in one of my hauntings in my house. I think I've read of a few stories on here too where it was just a partial form as well. Usually, I think in these cases, it's a pretty dark entity.