Very good point Slectric, but I will say people often misjudge distances especially under stress. The thing might have been much closer than the person wants to consider. If the guy was walking at night in a dark area, he was probably carrying a flashlight. I went back and re read his description and he doesn't mention the time of day or night. His first sighting was estimated at 50 feet, that's not that far. I agree 100 feet would be a stretch but if he already was looking for it, perhaps he was just seeing the shape of it moving through the trees.