To put that image in context for you, The man you see is Curly Bill who leads the cowboy gang at odds with the Earps. The night before Wyatts younger brother is shot and killed and his older brother is also shot and wounded by the cowboy gang. Curly Bill is watching Wyatt drive the wagon with his brother in a coffin on the back. Wyatt stops the wagon in front o Bill and says "I want you to know it's over". Bill replies with; "Well, bye".