Was at the game a few rows up from the 3B bag. After buxtons steal, there was a pitching change. Buxton walked over to 3rd and spent time chatting with Watkins and the ump. I watched him like a hawk for three minutes, and there was no apparent discussion with Watkins about anything injury related. He was relaxed and happy. Wasn’t flexing muscles or stretching or anything.
So I’d chalk it up to the ball hitting him.