about a guy who wonders what would have happened had he made a different choice at his graduation. The choice was a minor one

I think that its impossible to choose other things if we ever rewind time, with the same thought pattern/the same atoms of that event, the same everything, we would choose the same thing

I think its only possible if we changed the things that made him do the action, or chance. Chance that at this moment and time something werid happen to him, a person or a thought entered his mind and changed his decision, its a rare possibility, but still possible.