"they were so together in friendship that they felt themselves to be brothers "With a bond so strong they felt to be brothers. this relates to friendship cause there best friends and nothing can become between them. by knowing this we know friendship is a big part in the story.
The amigo brothers make a promise, a promise that no matter what its fair. they want to fight its only fair by making this promise no matter what. they must come back brothers
The fight was so important for them and anything can go down. they dreamed to be champions. "referee stunned by there savagery " they made a promise but they fought as if it was there destiny