At that very moment, in a quantum event that even the most sophisticated models could never have predicted, the symmetrical containment vessel at the heart of the Flux Capacitor experienced a state change. Spontaneous decay to an asymmetric state as predicted by Einstein's special theory of relativity. As the containment field's waveform collapsed matter and anti matter mixed in the largest convergence of opposing particles since the Big Bang, resulting in an uncontrolled release of energy that atomized everything within a 10 light year radius.
The end.
And as Douglas Adams warned, when someone asks the question to the answer of Life, the Universe, and Everything, the two invariably cancel each other out, replacing the universe with something massively and infinitely more weird. However, considering statistical probability and the odd nature of the return of the probability drive to Sona-Mask's laboratories, the resulting collapse flung the probability seed into the abnormal collapse returning everything to its previous similar state with the changes that Frogstar Fighter's were actually more of a blue color than a gray color, common humanoids ended up with an extra set of digits, and that narrative causality was infinitely more powerful than boring old physics and multiverse theory could go stuff it.
Anna however, never wondered about the extra-fingers, they had always been there anyway.