I read somewhere that GZ’s back was wet.
and Saint Trayvon, The Innocent, had mud on his pant knees
That is so racist.
(Just kidding).
That was the description from one of the police officers on scene. Since it was lightly raining, one would presume that he would be 'wet' front, back, side, and top.
One might assume that what the officer meant was that the back of his clothing was soaked, indicating that he had been laying on his back on the water soaked ground.