Possible late night highway sighting on I-10 near Sonora witnessed in Sutton County, Texas

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I was driving eastbound on I-10 near Sonora, Texas at 1:00 AM watching out intently for mule deer, which were everywhere, grazing beside the freeway and running across the road. What I at first assumed to be a tree, saguaro, or bush appeared in my headlights in the center median at mile marker 406 approximately 5 yards off the pavement. As I passed, I noticed the subject was turning in synchrony with my motion, displaying the same right side of his body to my view, until we were parallel to one another. Other reports indicate subjects shielding their eyes from bright lights at night, but this guy was simply rotating his body with no other obvious motion. Just as the headlights were fading on the subject, the subject turned directly to face my vehicle and began to move. In that instant, I realized how incredibly wide the shoulders were, and how much the body tapered down to the feet, and observed two very long arms. Immediately upon passing the subject, I was still watching in m...