What previous incident in the play foreshadowed Stanley's violation of blanche in this scene? Explain the symbolism.

In Scene Four, Blanche says......

There's something downright bestial about him! . . . He acts like an animal, has an animal's habits! Eats like one, moves like one, talks like one! There's even something sub-human something not quite to the stage of humanity yet! Yes, something ape-like about him, like one of the pictures I've seen in anthropological studies! Thousands and thousands of years have passed him right by, and there he is Stanley Kowalski survivor of the Stone Age! Bearing the raw meat home from the kill in the jungle! . . . Maybe he'll strike you or maybe he'll grunt and kiss you!