If that person had been a roboticist, they would have known what to do: stand in front of the car. It would have saved the cat's life. And most non-roboticists will immediately recognize this as a solution, too: these cars obviously detect humans right in front of them very well and will not move in that case. By the way, the same would have worked better for most human drivers as well. Even if you yelled at a human driver that there was a cat under the car, it would not be a reliable solution because they may not hear or understand you. But they, too, would almost certainly not run you over if you stood in front of the car.To be clear, I don't blame the witness for not doing this in the moment. And she probably has figured this out by now, too. I'm mostly pointing out that, as more and more people learn about robot taxis, more people will known how to help in such a situation, which is clearly what she wanted to do.