Time Travel fic where Time Fights Back Essentially, I'd like to see a Time Travel fic where, when the traveller attempts to change things, Time pushes back and tries to conserve the known timeline. If Harry went back to do something smarter in the Shrieking Shack scene than chain a man who could turn himself into a tiny rat and escape whenever he liked and then caught Pettigrew, he could escape later and Sirius would still end up on the run. Essentially, a fix it, want-of-a-nail fic where canon stations are met anyway despite the time traveller's best efforts.