A: Well… yes, technically that’s probably true. Another possibility is that it would create a major paradox, the results of which could cause a chain reaction that would unravel the very fabric of the space time continuum, and destroy the entire universe! The point is, it just makes for a better game to imagine that everything freezes as last altered. Basically it comes down to Artistic License.

It’s kind of like how things worked in the original movies: did it really make sense that images of people would be gradually erased from photographs, from bottom to top, during time spent in the past? No, but it made for a better movie. So it is here: Un-inventing time travel makes for a great end-game moment, even if it doesn’t quite make sense from a temporal physics standpoint.