But now I see it to be used only for death and destruction. I cannot face the responsibility involved in having rediscovered this math. What do these lines reveal about Aub?
btw Aub is a character

the answer is chance

its hard for me to see which word is supposed to be in bold. if i knew then i would be able to better.

greet them:

buenas noches.

that is considered night time which is when "good night" is used.