I did think Rose was a good opportunity to have someone angry on Donna's behalf, and it made perfect sense to me that she would be furious, so I couldn't really resist writing this. I did think Rose and Donna made a good team in Turn Left, and even if Donna couldn't remember it I think Rose would always be fond of her for that, which would just make her angrier. That said, I did want to highlight the futility of the Doctor's situation and the damned if you, damned if you don't choice he has to make. Easy as it is to condemn him for it, I don't think I know too many people who could watch their best friend die and do nothing to save them.

Thanks!