Lonesome Dove, Volume 2: Comanche Moon by Larry McMurtry

AS SCULL LISTENED to old Goyeto's screams he wondered what had occurred. The skinner was being skinned, that much he could see, although he only glanced up once or twice. He could not risk more; not with the sun so bright. But Ahumado was doing the skinning and, to judge from the intensity of Goyeto's screams, doing it badly on purpose. Where the skinner, Goyeto, had only taken skin, Ahumado pulled away strips of flesh, and did it so cavalierly that Goyeto soon wore out his voice and his heart. He died well before sunset, only partially skinned.

Once the shadows came Scull could risk more looks-he saw that almost all the people in the camp were leaving, unnerved by the unexpected execution of Goyeto.