Instructor looked at the girl, who was obviously new to the job. "Can you take us to our room later?" He asked. "Our room is B-4 according to the Captain." He returned to speak to Naina on the Katherines. "So what does the Katherine you know of do?" He asked. "Judging by how you asked earlier, you must be pretty close."
Hearing the conversation Donna thought of herself in that world as well. If the Falson War is not there then her mother shouldn't be killed by an assassination and her father not driven by vengeance to sponsor the war but in exchange, she wouldn't be able to meet the Instructor. There could also be some people that wouldn't exist and vice-versa.