I'm writing a short story that involves time travel but I have a question about my plot. Both my of characters live in the year 2030. A robot from the future comes and tells Rob that the world will be engulfed in a nuclear war and that 98% of the world's population will perish. The robot says that he can take only one person with him to the future and he wants it to be Rob because he plays a huge role in the future. Rob, however, gives up his spot to Sally, his love interest. In the future, Sally sees how much love Rob has for her and decides to send the robot back in time to rescue Rob. Am I breaking a time travel rule? basically, the robot is sent the first time by Sally to rescue Rob in the first place.