After Mark causes Katya to crash her car, they're seen arguing on the plaza as police arrive. Alex hears the sirens from his office and peers out the window, from which his parents are clearly visible on the plaza as are their cars in the street. Given Alex's highly advanced cognitive and observational abilities, he would have seen his parents, or at least recognized both their vehicles in the street, and wondered what was going on. Instead he shows no real interest for what's happening down on the plaza.