If the girl in the movie newsreel had not been Mary Dalton, what would Bigger’s feelings toward the scene have been and why? In other words, if the scene were of any rich white girl frolicking in Florida, what would his reaction have been? (34-35)

I believe that if Bigger hadn't known the girl and had randomly seen the newsreel he wouldn't have thought twice. Bigger isn't a terribly empathetic character. He would not have been affected by something that did not directly pertain to him as an individual.