The scene where Black Bart and the Waco Kid stand up to Taggart and his men at the railroad. After an hour of black characters passively accepting racial abuse, Bart tells Taggart to "watch that 'boy' shit, redneck." As that villains line up to kill Bart, there's real tension in that scene, complete with dramatic music, as if they might actually Just Shoot Him. And saving the hero is up to the Waco Kid, a character we don't quite believe in yet. A brilliant scene on many levels.
Bart: Well, don't just stand there looking stupid grasping your hands in pain — how about a little applause for the Waco Kid?
[Villains applaud sheepishly]