Sighting along trail in SE part of Francis Marion National Forest witnessed in Berkeley County, South Carolina

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I think I might have seen something while I was in South Carolina last May, but I'm really not sure. Anyways, I live in Florida and last May I went on a herping trip to South Carolina looking for snakes to collect and photograph.While I was in Francis Marion National Forest walking a trail with my eyes set to the ground on the side of the trail looking for snakes I saw something leap across the trail about 50 yards ahead of me from left to right in one leap.It was on two legs about the size of a person or bigger and was uniform brown in color.This is basically all I saw. I was only about 15-20 minutes into the trail when this occurred.The trail was very narrow but straight and densely wooded on either side.I was by myself and I never saw anybody else on the trail or in the park during my time there. I know this is disjointed but let me try to describe this further. After I saw this thing leap across the trail ahead of me, I stopped in place and listened, somewhat startled.I did not hea...