Smith's assimilation of the Oracle that gives him his new-found understanding of the Matrix and his predictive capabilities. Smith actually sees himself being destroyed by Neo after he assimilates him in that final, fateful confrontation in the Maga City crater. That's why he backs off: Get away from me! - Smith And then convinces himself that: It's a trick! - Smith Just a thought that I felt should be shared. It's interesting that Smith, having assimilated the Oracle, sees himself standing victorious over Neo's body, but it isn't until the final few moments that he sees the whole vision, and is terrified of it. Why is this? I believe it to be to do with choice, and never being able to see past choices that are not understood. So what is the trigger? Everything that has a beginning has an end, Neo.
The ARCHTIECT is the CONSCIENCE, the voice who tries to tell you what to do and how to do it the right way. It's the TEMPTATION caused by Seeing things, hearing things, smelling tasting and feeling things, that causes someone to rebel or delay their purpose, and go about desires of their own....to rebel against the system... Its also worth Noting that all these characters represent rebellious Programs (Neo is the ONE Program) all of whom wish to go about their own desires in the MATRIX, and oppose the Conscience....to do things their own way....
Can you live a day to day routine with no end in sight and not quite possibly question your existence? Objective truth is no longer agreed upon, as pundits, politicians, and tech magnates each present their vision of what's real, and aggressively market it to the masses. Our current crisis, then, is whatever you choose it to be. You just have to choose a side in the war: one to be us, and another to be them. Hence, a man named Thomas who can't shake the idea that there's something wrong with the world around him, that he feels disconnected from others in a way that he was never meant to be. And when others finally tell him that he's living in an illusion, he doesn't quite believe them not until he sees something, someone, for himself that reminds him of what, exactly, he is missing: that he used to be in love.