He walked home with a mountain feeling of fear. When he reached his doorway, he hesitated about going up. He didnt want to rob Blum's; he was scared.
Book 2: Flight
It was the first time he had ever been in their presence without feeling fearful. He was following a strange path into a strange land and his nerves where hungry to where it led.
N0; no; no ..... Bigger, not that...
Book 3: Fate
I didn't want to kill! But what I killed for, I am! It must've been pretty deep in me to make me kill.
Previous to this scene, Bigger exemplifies his bravery to his friends about robbing Blum's. However, as the narration shows, he is scared on the inside. He knows he is weak but forces his will on his friends anyways. So even though he tries to demonstrate that he's tough, he's really scared and trapped inside of his situation.
Bigger had just met with Gus, G.H., and Jack. It was the first time they had talked since Bigger's departure from the group. He exhibits no fear, unlike any situation before. Now that he has released his fears of the barriers between the inferior and superior, he can now freely live the way he desires without being "trapped".
This scene is showing how Bigger is finally realizing his destiny. He is now understanding that what he was meant to be was a killer, and that what he did was for a good reason. He is explaining to Max how although it was not in his best interest to kill, there must've been a good reasoning for it if it was to make him kill.